Friday

April 18, 2014

April 18, 2014

Number of results: 99,741

**chemistry**

How much heat is required to vaporize 3.50L of at its normal boiling point? The following data are given for Carbon Tetrachloride. Normal melting point, -23 Degrees Celsius, normal boiling point, 77 Degrees Celsius; density of liquid, 1.59g/mL; Delta H (FUSION): 3.28 kJ mol^-1...
*Monday, December 8, 2008 at 3:14pm by Linda*

**chemistry**

How much heat is required to vaporize 3.50L of at its normal boiling point? The following data are given for Carbon Tetrachloride. Normal melting point, -23 Degrees Celsius, normal boiling point, 77 Degrees Celsius; density of liquid, 1.59g/mL; Delta H (FUSION): 3.28 kJ mol^-1...
*Monday, December 8, 2008 at 3:14pm by Linda*

**AP Chemistry**

The heat of reaction for burning 1 mole of a certain compound X is known to be -477.7 kJ. The calorimeter constant of the bomb being used is 2500 j/degree celsius and the initial temperature of the water is 23.2 degrees celsius. a) if 22.54 g of compound X (MM=46.0) is burned ...
*Monday, February 15, 2010 at 3:01pm by Jacob*

**Physics**

An ice chest at a beach party contains 12 cans of soda at 3.05 °C. Each can of soda has a mass of 0.35 kg and a specific heat capacity of 3800 J/(kg C°). Someone adds a 7.15-kg watermelon at 25.0 °C to the chest. The specific heat capacity of watermelon is nearly the same as ...
*Friday, November 17, 2006 at 7:25pm by Sara*

**chemistry**

When 45 grams of an alloy is dropped into 100.0 grams of water at 25 degrees celcius, the final temperature is 37 degrees celcius. what is the specific heat of the alloy? the alloys Temperature is 100 degrees celsius
*Wednesday, June 11, 2008 at 10:01am by sdfsgfsf*

**Chemistry**

Determine if the solubility would increase, decrease, or stay the same: 1) A saturated solution of sugar water is cooled from room temp to 0 degrees Celsius. 2) A solution of ocean water with dissolved oxygen is heated from 10 degrees Celsius to 15 degrees Celsius. 3) A ...
*Tuesday, February 19, 2013 at 2:58pm by Margaret*

**chemistry(please check formula)**

how much energy i kj is required to change the temp of 1.00 kg of fe from 25.0 degrees celsius to 1515 degrees celsius? so it would be q= (.449)(1.00)(1490)-correct?
*Sunday, April 4, 2010 at 8:09pm by danielle*

**Chemistry**

A 5.0-g Sample of KBr at 25.0 degrees celsius dissolves in 25.0 degrees celsius 25.0 mL of water also at 25.0 degrees celsius. The final equilibrium temperature of the resulting soltution is 18.1 degrees celsius. What is the enthalpy of of solution in kilojoules per mole of KBr?
*Thursday, December 2, 2010 at 3:21pm by Sally*

**physics**

if you wished to warm 100 kg of water by 15 degrees celsius for your bath, how much heat would be required? (give your answer in calories and joules)
*Thursday, January 28, 2010 at 8:29pm by maria*

**chemistry**

You have 53 g of aluminum at25 degrees C. How much heat must be added to raise its temperature to 139 degrees C? Assume the specific heat of aluminum is 903 J/kg · degrees C. Answer in units of J
*Tuesday, April 24, 2012 at 6:35pm by please help*

**Chemistry**

The rod is cooler than the water; therefore, the rod will gain heat and the water will lose heat and the two added together will be zero (one will be negative). massrod x specific heat rod x (Tfinal-Tinitial) + massH2O x specific heat water x (Tfinal-Tinitial) = 0 Solve for ...
*Tuesday, October 28, 2008 at 4:54pm by DrBob222*

**phy**

Calculate the change in internal energy of 2kg of water at 90 degree Celsius when it is changed to 3.30m3 of steam at 100oC . The whole process occurs at atmospheric pressure. The latent heat of vaporization of water is 2.26×106J/kg
*Thursday, January 24, 2013 at 10:13pm by christ*

**physics**

Calculate the change in internal energy of 2kg of water at 90 degree Celsius when it is changed to 3.30m3 of steam at 100oC . The whole process occurs at atmospheric pressure. The latent heat of vaporization of water is 2.26×106J/kg
*Wednesday, December 4, 2013 at 3:18am by NDuka*

**Chemistry**

q = mass water x specific heat water x delta T water. Note the correct spelling of celsius.
*Saturday, December 4, 2010 at 10:10pm by DrBob222*

**Physics **

how many grams of water at 20 degrees celcius are necessary to change 800.0g of water at 90.0 degrees celsius to 50.0 degrees celcius?
*Sunday, July 21, 2013 at 4:24am by Dale*

**Physics**

A 43 g ice cube at 0 C is placed in 882 g of water at 81 C. What is the final temperature of the mixture? The specific heat of water is 4186 J/kg · C and its latent heat of fusion is 3.33 × 105 J/kg . Answer in units of C
*Tuesday, April 23, 2013 at 8:38pm by dallas*

**Physics**

A cube of ice is taken from the freezer at -8.5 degrees celsius and placed in a 100 gram aluminum calorimeter filled with 300 grams of water at room temperature of 20 degrees celsius. the final situation is observed to be all water at 17 degrees celsius. what was the mass of ...
*Sunday, March 18, 2012 at 3:29pm by Donald *

**chemistry**

Please note the correct spelling of Celsius. How much heat does the CaCl2 add to the water? That is 7.2 g (1 mol/molar mass CaCl2) x (82,800 Joules/mol). Then q = mass water x specific heat water x (Tf-Ti) where Tf is the final T and Ti is the initial T. Most dilute solutions ...
*Friday, October 3, 2008 at 11:23pm by DrBob222*

**western michigan university**

1050 calories of heat from soybean oil was applied to a 250 gram sample of liquid water with an initial temperature of 25 degrees Celsius. Determine (a) the final temperature of water and (b) the change in temperature.
*Thursday, December 6, 2012 at 10:30pm by lorena*

**PHYSICAL SCIENCE**

change 100 gallons of water to mass of water. then heat=masswater*specific heat water*changeinTemp
*Saturday, June 18, 2011 at 9:26am by bobpursley*

**physics**

The specific heat capacity of steel is 445 Jkg K. How much energy is required to raise the temperature of a 0.410g of kettle which contains 1.2L of water from 20 degrees Celsius to boiling point?
*Friday, July 23, 2010 at 1:34am by Anonymous *

**chemistry**

If all the energy obtained from burning 1.23 pounds of propane (fuel value is 11.09 kcal/g) is used to heat 125.0 kg of water at an initial temperature of 21.8 °C, what is the final temperature? Hint: The heat, q, released by burning propane is absorbed by the water. Use the ...
*Sunday, March 25, 2012 at 9:30pm by Yasha*

**Chemistry 1 HN**

Note the correct spelling of celsius. heat lost by Fe + heat gained by water = 0 [mass Fe x specific heat Fe x (Tfinal-Tintial)] + [mass H2O x specific heat H2O x (Tfinal-Tinitial)] = 0 Substitute and solve for the only unknown.
*Tuesday, January 1, 2013 at 10:59am by DrBob222*

**physics**

After 6.00 kg of water at 80.4 oC is mixed in a perfect thermos with 3.00 kg of ice at 0.0 oC, the mixture is allowed to reach equilibrium. When heat is added to or removed from a solid or liquid of mass m and specific heat capacity c, the change in entropy can be shown to be...
*Saturday, December 1, 2012 at 9:11pm by g*

**PHYSICS**

After 6.00 kg of water at 80.4 oC is mixed in a perfect thermos with 3.00 kg of ice at 0.0 oC, the mixture is allowed to reach equilibrium. When heat is added to or removed from a solid or liquid of mass m and specific heat capacity c, the change in entropy can be shown to be...
*Saturday, December 1, 2012 at 11:06pm by HELP*

**Chemistry**

What is the specific heat of Gold if 15.3 J of heat changes 12 grams by 8 degrees Celsius? I got 7.834, would this be correct do you think? Thanks Jiskha.
*Tuesday, June 9, 2009 at 7:26pm by Jay*

**physics**

an immersion heat can supply heat at a rate of 5.2 x 10 to the power of 2 joules per second. calculate the time that it wil take to completly evaporate 1.25 x 10 to the power of minus 1 kg water initially at a temperature of 21 degrees celsius
*Sunday, January 20, 2008 at 9:07pm by audrey*

**chemistry**

Heat a known mass of a metal to a known temperature (say, for example, 10.00 g at 78.5 deg C) Add the metal to a known mass of water at a known temperature (say 75.00 g at 25.0 deg C) in a calorimeter. Let the metal and the water come to an equilibrium temperature, Tf. (The ...
*Tuesday, April 16, 2013 at 10:48pm by Rebekah*

**Science**

Is the answer 26 celsius? Is it possible that the temp is greater than 25 celsius? A 500 mL bottle of water, which is at 25 degrees C, is poured over 120 g of ice at -8 degrees C. What will be the final temperature of the water when all the ice has melted. Assume that ...
*Thursday, January 21, 2010 at 6:22pm by Bert*

**had**

A 0.106 kg ice cube is taken out of a freezer with temperature -16°C. It is then added to a glass of water with mass 0.25 kg. The water initially has a temperature of 24.2 °C. Assume no heat is added or lost to the surroundings. Calculate the amount heat required to completely...
*Monday, March 3, 2014 at 10:09am by Anonymous*

**Science**

How much energy is released when a 5600-g sample of water cools from 99 degrees C to 28 degrees C. The specific heat capacity of water is 4.18 J/(g*degrees C) Can someone please tell me the steps to do this?
*Tuesday, April 22, 2008 at 12:41am by Amanda*

**math**

If i place a dish of ice outside in the sun, The ice has a mass of 0.59 kg and a surface area of 0.039 m2. Assuming that the ice is originally at 0 °C and using my answer for part b, which was 1370w/m^2 * 49 * 0.039m^2 = 26.18 watts, How long do i have to wait until all the ...
*Tuesday, December 16, 2008 at 5:56pm by trigger*

**Physics**

A 0.260-kg piece of aluminum that has a temperature of -165 °C is added to 1.4 kg of water that has a temperature of 3.0 °C. At equilibrium the temperature is 0 °C. Ignoring the container and assuming that the heat exchanged with the surroundings is negligible, determine the ...
*Friday, November 17, 2006 at 7:54pm by Sara*

**chem**

q1 = heat to warm ice from -20 to zero but not melt it. q1 = mass ice x specific heat ice x delta T (delta T = 20). q2 = heat to melt ice at zero. q2 = mass ice x heat fusion. q3 = heat to raise temperature from zero for liquid water to 100 C. q3 = mass water x specific heat ...
*Sunday, April 13, 2008 at 5:50pm by DrBob222*

**college chem**

Note the correct spelling of celsius. There are two equations you need to do this. 1. WITHIN a phase, q = mass x specific heat x (Tfinal-Tinitial) 2a. At the phase change, q = mass x heat fusion at melting point or 2b. At the boiling point, q = mass x heat vaporization. For ...
*Monday, February 4, 2013 at 11:03pm by DrBob222*

**chem**

calculate the amount of heat (kcal) released when 50.0 g of water at 100degrees Celsius hits the skin and cools to a body temperature of 37 degrees Celsius.
*Thursday, June 2, 2011 at 7:18pm by d*

**Physics**

In a physics experiment, Wendy immersed a copper of mass 300g in 100 degree C in boiling water and left it there for several minutes. She then transferred the cube to 0.2 kg of water at 10 degrees C. The final temperature of the mixture was 21 degrees C. What value did she get...
*Sunday, April 18, 2010 at 4:21pm by Samantha Chow*

**chemistry**

a 100.00 mL sample of water has an initial temperature of 20.0 degrees C. The water is heated, and after 5 minutes its temperature is 50 degrees C. approximately how much energy was absorbed by the water? (the specific heat of wter is 4.18 J/g. degrees C
*Saturday, September 3, 2011 at 8:12pm by kelly*

**chem-answer check please**

Compounds like CCl2F2 are known as chlorofluorocarbons, or CFCs. These compounds were once widely used as refrigerants but are now being replaced by compounds that are believed to be less harmful to the environment. The heat of vaporization of CCl2F2 is 289 J/g. What mass of ...
*Thursday, January 10, 2013 at 4:41pm by Samantha*

**Chemistry**

A sample of benzoic acid contaminated with NaCl and sand is to be recrystallized: Benzoid Acid: Solubility in water at 100 degrees Celsius in g/100 mL = 6.8, at 0 degrees Celsius in g/100 mL = 0.2. NaCl: Solubility in water at 100 degrees Celsius in g/100 mL = 39.1, at 0 ...
*Sunday, October 21, 2012 at 8:58pm by Trisha*

**physics**

After 6.00 kg of water at 80.4 oC is mixed in a perfect thermos with 3.00 kg of ice at 0.0 oC, the mixture is allowed to reach equilibrium. When heat is added to or removed from a solid or liquid of mass m and specific heat capacity c, the change in entropy can be shown to be...
*Saturday, December 1, 2012 at 6:52pm by angie*

**physics**

so you find the specific heat of water, then multiply that times the change in temperature then divide that into the joules?
*Thursday, January 26, 2012 at 1:46pm by mariah*

**Chemistry**

q = mass water x specific heat water x delta T. 714,000 = mass water x specific heat water x 30. Substitute specific heat water and solve for mass water.
*Sunday, December 12, 2010 at 12:39am by DrBob222*

**physics**

The amount of heat Q needed to turn a mass m of room temperature T_1 water into steam at 100degrees C T_2 can be found using the specific heat c of water and the heat of vaporization H_v of water at 1 atmosphere of pressure. Suppose that a commercial espresso machine in a ...
*Thursday, November 27, 2008 at 8:22pm by Anonymous*

**Thermochemistry Ap Chem homework**

Any help would be great, even if it is just a way to start or a formula. Calculate the heat necessary to convert 10.0 g of water (just melted) at 0 degrees Celcius to water at 20 degrees Celcius, assuming that the specific heat remains constant at 1 cal/gram degrees celcius.
*Monday, November 15, 2010 at 5:58pm by Chris*

**Physics PLEASE HELP**

After 6.00 kg of water at 77.3 oC is mixed in a perfect thermos with 3.00 kg of ice at 0.0 oC, the mixture is allowed to reach equilibrium. When heat is added to or removed from a solid or liquid of mass m and specific heat capacity c, the change in entropy can be shown to be...
*Saturday, November 10, 2012 at 2:46am by Anonymous*

**Math/Physics**

Two kg of water at a temperature of 50 degrees C have 485.3 kJ of heat transferred from them, resulting in a mixture of ice/water at 0 degrees C. What is the composition of the mixture? This is what I did and would like verification of my answer. 2*4.183*-50 = -418.3 kJ I then...
*Saturday, March 23, 2013 at 2:20am by Dylan*

**Chem**

can you show how u got the ansr on this question? a small pebble is heated and placed in a foam cup calorimeter containing 25.0mL of water at 25 degrees celsius. the water reaches a maximum temp of 26.4 degrees celsius. how many joules of heat were released by the pebble? ...
*Wednesday, January 20, 2010 at 10:59pm by Ryan*

**Chemistry**

When a 77 g piece of metal with a temperature of 88 Degree Celsius is placed into 277 g of water having a temperature of 20 degree Celsius, the final temperature of the metal and water is 23.3 degree Celsius. What must be the specific heat of the metal?
*Tuesday, February 14, 2012 at 11:07pm by Mom*

**Chemistry**

When a 77 g piece of metal with a temperature of 88 Degree Celsius is placed into 277 g of water having a temperature of 20 degree Celsius, the final temperature of the metal and water is 23.3 degree Celsius. What must be the specific heat of the metal?
*Tuesday, February 14, 2012 at 11:29pm by Mom*

**Chemistry**

When a 77 g piece of metal with a temperature of 88 Degree Celsius is placed into 277 g of water having a temperature of 20 degree Celsius, the final temperature of the metal and water is 23.3 degree Celsius. What must be the specific heat of the metal?
*Tuesday, February 14, 2012 at 11:33pm by Mom*

**Physics 11th grade 'Heat'**

1) Nova, whose mass is 50.0 kg, stays out skiing for too long and her body temperature drops by 2.00 degree celsius . What is the amount of heat lost from Nova's body? (cHuman body= 3470 J/kg degre celcius) 2) Phoebe's insulated foam cup is filled with 0.150 kg of the coffee (...
*Wednesday, March 13, 2013 at 8:51am by Isis*

**Chemistry**

q1 = heat to melt benzene. q1 = mass benzene x heat fusion. q2 = heat to move benzene from 5.5 to 45 C. Note the correct spelling of celsius. q2 = mass benzene x specific heat benzene x (Tfinal-Tinitial). q3 = heat lost by steam to condense to liquid water. q3 = mass steam x ...
*Friday, February 26, 2010 at 11:00am by DrBob222*

**science so confused??**

heat capacity; temperature ; equal; calorimeter. Now on the first, the question is poorly worded. Heat given off is equal to the product of mass x specific heat capacity x change in temperature. Those three things define heat change. In olden days, mass x specific heat content...
*Tuesday, April 22, 2008 at 1:18am by bobpursley*

**college**

Q = mc(T2-T1) where Q = heat in J, m = mass in kg, c = specific heat capacity in J/(g*K), T = temperature in Kelvin,, **change in temperature can have unit degree Celsius or Kelvin,, thus you can use it interchangeably (what i mean is that the units for c can also be J/(g*C)) ...
*Wednesday, October 27, 2010 at 3:23am by jai*

**Physics 100**

A 355-g piece of metal at 48.0 degree celsius is dropped into 111g of water at 15.0 degree celsius.If the final temperature of the mixture is 32.5 degree celsius what is the specific heat of the metal?
*Monday, April 16, 2012 at 5:08pm by Sue*

**chemistry**

Energy to cause temperature change is computed by Q = mC(dT), with Q = change in energy, m = mass, C = specific heat, and dT = temperature change. Find the volume of the air (remember to exclude the person), and then find the mass of that air, given as 1.2kg/m^3 = 42.384kg/ft^...
*Saturday, January 1, 2011 at 11:34am by Marth*

**Physical Science**

A 50.0g sliver spoon at 20.0 degrees celsius is placed in a cup of cofee at 90.0 degrees celsius. How much heat does the spoon absorb from the cofee to reach a temperature of 89.0 degrees celsius? Please explain...
*Thursday, November 1, 2007 at 11:10pm by Sarah*

**physics**

In lab, Will burns a 0.6 g peanut beneath 48 g of water, which increases in temperature from 22 degree C to 55 degree C. The amount of heat absorbed by the water can be found with the equation Q =cm \Delta T, where Q is the amount of heat, c the specific heat of water, m the ...
*Saturday, March 31, 2012 at 7:39pm by christy*

**science**

how much heat is required to heat 500 g of copper from 20 degree celsius to 80 degree celsius? specific heat of copper is 0.093 cal/g- degree celsius
*Sunday, December 2, 2012 at 9:39pm by sam*

**Chemistry**

How many kilojoules of heat are absorbed when 1.00L of water is heated from 18 degrees C to 85 degrees C? Did I do this right? 1000g H2O x 4.18 x 67 = 280060 kilojoules (my book says the specific heat for water in J/g x degrees C = 4.18, and for cal/g x degrees C = 1.00) Would...
*Wednesday, May 19, 2010 at 10:42pm by Sarah*

**Chemistry**

Calculate the heat released when 64.5g of steam at 119 C is converted to water at 36 C. Assume the specific heat is 4.184 J/g*C for water, the specific heat of steam is 1.99J/g*C, and the heat of vaporization is 40.79 kJ/mol for water.
*Friday, June 17, 2011 at 6:59pm by Sydney*

**chemistry**

the molar heat capacity of water at 25 degrees celsius is 75.29JK/mol. an exothermic reaction with -5.00kJ proceeded to completion in a 200mL dilute aqueous solution,initially at 16.0 degrees celsius. what is the final temperature of the solution ? clearly show all working
*Wednesday, April 11, 2012 at 2:42pm by ayanda*

**physics**

How much heat does it take to warm up a 300g glass of water by 30 degrees C? (what is the formula for the specific heat of water?)
*Monday, March 21, 2011 at 6:54pm by Aria*

**Chemistry**

(heat released by condensation of steam) + (heat released by cooling 100 C water to Tfinal) + (heat absorbed by 4.40 g H2O at 5.0 degrees C moving up to Tf) = 0 [0.550 x heat vap] + (0.550 x specific heat water x (Tfinal-Tinitial)] + [4.40 x specific heat water x (Tfinal-...
*Tuesday, January 24, 2012 at 12:53pm by DrBob222*

**mechanical systems**

heat= mass*sepcificheat capcity*changetemp I dont know if you can find the specific heat capacity for water in SAE units. So here it is : specific heat capacity water= 1BTU./lb-degF now convert 1500 gallons water to lbs...That depends on temperature, so take the starting ...
*Sunday, April 15, 2012 at 10:03pm by bobpursley*

**physics**

A cubical piece of heat-shield-tile from the space shuttle measures 0.18 m on a side and has a thermal conductivity of 0.065 J/(s·m·C°). The outer surface of the tile is heated to a temperature of 1050°C, while the inner surface is maintained at a temperature of 22°C. (a) How ...
*Monday, May 21, 2012 at 5:52am by robert*

**physics**

How much heat must be added to 0.55 kg of aluminum to change it from a solid at 180°C to a liquid at 660°C (its melting point)? The latent heat of fusion for aluminum is 4.0x10^5 J/kg. I understand the Equation Q=mc times change it T would that be .55 times 4.0 x 10^5 times (...
*Friday, December 10, 2010 at 6:24pm by maria*

**physics, thermo**

calculate the heat required to produce 1.7 kg of wet steam at 2000 kpa from water at 160 degrees celsius and a dryness fraction of 81%, answer in kj.
*Monday, May 27, 2013 at 2:35pm by chad, please help*

**Value of lava mass**

This question has been posted before, and I amlooking for critque of my answer ..Thanks !!!! The specific heat capacity of the lava is 1600 J kg^-1 degres celsuis ^-1. when all the erupted lava cools from the eruption temperature of 1050 degrees Celsius to 15 degrees celsius, ...
*Saturday, May 5, 2007 at 11:06am by Freddo*

**chemistry**

Consider the reaction HCl + NaOH ->NaCl + H2O Given: HCl Solution: 22 degrees celsius NaOH Solution: 22 degrees celsius Final Temperature: 26.1 degrees celsius A. Calculate the amount of heat evolved when 15 mL of 1.0 M HCl was mixed with 35 mL of 1.0 M NaOH B. Calculate ...
*Monday, March 28, 2011 at 12:11pm by Vanessa*

**physics**

How much ice at zero degrees celsius is needed to cool 250g of water at 25 degrees celsius to zero degrees celsius.
*Thursday, January 12, 2012 at 10:09am by ceasar*

**Chemistry**

In a mountainous location, the boiling point of pure water is found to be 95 degrees Celsius. How many grams of sodium chloride much be added to 1 kg of water to bring the boiling point back to 100 degrees Celsius? Assume that sodium chloride behaves ideally in solution.
*Tuesday, September 14, 2010 at 5:36pm by Mike *

**chem**

two metals both at a temperature of 25 degrees celsius are placed in seperate beakers. metal A has a larger specific heat than metal B. which beaker will exhibit a greater change in temperature
*Thursday, June 30, 2011 at 8:08pm by lynn*

**chemistry**

what mass of water at 10.0 degrees C is needed to cool 500.0ml of tea from 25.0 degrees C to 18.3 degrees C? Density and specific heat of the tea are the same as water.
*Friday, April 27, 2012 at 10:30pm by RoseBud*

**Thermodynamics of steam**

A boiler furnace releases 10000.000kJ of heat for each kg of fuel burned and produces dry saturated steam at 10000.000kPa from feed water at 190.000 degrees Celsius. How many kg of steam will be produced for each kg of fuel burned if the boiler had an efficiency of 69%. ANS = ...
*Monday, July 22, 2013 at 9:07pm by Danny*

**chemistry**

50ml of water at 46.9 C were mixed with 50ml of water at 25.1 C in a calorimeter also at 25.1 C. The final temperature was 30.1 C Assuming that neither the density of water nor its specific heat capacity change with temperature, calculate the total heat capacity of the ...
*Tuesday, March 1, 2011 at 3:56pm by venus*

**Chemistry**

How long would it take a 20Kw heater to warm up 1000 litres of water from 15 degrees to 55 degrees in hours? specific heat of water = 4.18kJ. also How much heat would a block of ice melting at 200Kg per hour absorb? thanks if anyone can help!
*Sunday, October 21, 2012 at 1:51pm by Dave*

**Physics**

What rise in temperature occurs when 10g of steam at 100 degree celcius are passed into 400g of water at 10 degrees celcius taking the specific heat capacity of water to be 4.2J/gK and specific latent heat of vapourisation of steam to be 2268J/g
*Sunday, January 16, 2011 at 2:26am by Sarah*

**Physics**

A boiler furnace releases 10000.000kJ of heat for each kg of fuel burned and produces dry saturated steam at 10000.000kPa from feed water at 190.000 degrees Celsius. How many kg of steam will be produced for each kg of fuel burned if the boiler had an efficiency of 69%? ANS = ...
*Wednesday, July 31, 2013 at 3:06pm by Danny*

**chemistry**

What mass (in grams) of CaCl2(s) must be dissolved in pure water at 10.0 deg Celsius to make a 26.4 mL solution and to increase the solution temperature to 16.4 deg Celsius? Assume that there is no heat loss from the solution and that the solution has the same physical ...
*Sunday, November 16, 2008 at 3:43am by Anonymous*

**chemistry**

How much heat is required to warm 250.4 g of water from 22.6 C to 75.8 C given that the specific heat capacity of water is 4.184 J/gx degrees C?
*Thursday, November 3, 2011 at 12:24pm by Teresa*

**Chemistry**

How many joules of heat are needed to heat 25.0 g of ice at -5.0 degrees celcius to a final temperature of 40.0 degrees celcius? The specific heat of ice is 2.1 j. Our teacher mention to consider the state of water present at 40.0 degrees celcius which is confusing me. Any ...
*Wednesday, April 6, 2011 at 1:20pm by Thao*

**Physics**

A mass of 4.77 kg of chilled water at 0C is placed in a freezer which is kept at −19.2C. Approximately how much electric energy is needed to operate the compressor to cool this water to −19.2 C if the room temperature is maintained at 24.2C? The freezer works ...
*Sunday, January 13, 2013 at 1:16pm by physicshelp*

**Science**

You add 7800 calories of heat to a block of ice at -40 degrees celsius. the temperature of the ice rises to 0 degrees celsius. how much ice did you heat up?
*Tuesday, May 13, 2008 at 6:22pm by Bob*

**chemistry**

1. a) 50ml of water at 46.9°C were mixed with 50ml of water at 25.1°C in a calorimeter also at 25.1°C. The final temperature was 30.1°C. Assuming that neither the density of water nor its specific heat capacity change with temperature, calculate the total heat capacity of the ...
*Monday, November 12, 2012 at 2:21pm by Cicily*

**chemistry**

* A 50 gram sample of an unknown metal warms from 18 to 58 after absorbing 800 joules of energy. what is the specific heat of the metal? *copper has a specific heat of 0.387 j/g degree celsius. what is the mass of a piece of copper that undergoes a 21.0 C temperature change ...
*Tuesday, December 11, 2012 at 5:23pm by help*

**physics**

Q = Pt = mc(T2-T1) where Q = heat/energy (in J) P = Power (in W) t = time (in s) m = mass (in kg) c = specific heat capacity (in J/kg-K) = 4.184 J/kg-K for water T = temperature (in C or K) we're solving for mass. substituting, (7.5*1000)*(3*24*60*60) = m*4.184*(70-18) ...
*Thursday, October 27, 2011 at 12:45am by Jai*

**Chemistry **

If 395 grams of water at 21 Celsius absorbs 285kJ of heat from a mountain climbers stove at an elevation where the boiling point of water is 87 Celsius, is this amount of energy sufficient to heat the water to its boiling point? How many kJ are required to boil the water?
*Sunday, November 6, 2011 at 1:25pm by Kay *

**physics**

An 8.56 kg block of ice at 0 degrees celsius is sliding on a rough horizontal icehouse floor (also at 0 degrees celsius) at 15.6 m/s. Assume that half of any heat generated goes into the floor and the rest goes into the ice. How much ice (in kg) has melted after the speed of ...
*Friday, December 4, 2009 at 8:35pm by AE*

**physics**

134 g of water at 7°C is added to ice at 0°C. If the final temperature of the system (which you can assume is isolated) is 0°C, determine HOW MUCH ICE MELTED. The specific heat of water is 4186 J/kg·°C. The latent heat of fusion for H2O is 335,000 J/kg.
*Wednesday, November 14, 2012 at 3:37pm by Joseph*

**Chemistry**

How much energy (heat) is required to convert 248 g of water from 0oC to 154oC? Assume that the water begins as a liquid, that the specific heat of water is 4.184 J/g.oC over the entire liquid range, that the specific heat of steam is 1.99 J/g.oC, and the heat of vaporization ...
*Tuesday, September 16, 2008 at 9:02pm by Jimmy*

**Chem**

How much energy (heat) is required to convert 248 g of water from 0oC to 154oC? Assume that the water begins as a liquid, that the specific heat of water is 4.184 J/g.oC over the entire liquid range, that the specific heat of steam is 1.99 J/g.oC, and the heat of vaporization ...
*Saturday, February 4, 2012 at 9:46pm by Dan *

**Chemistry**

Note the correct spelling of celsius. On condensation, the steam loses q = mass steam x heat condensation. That water will be at 100 C. Then [mass steam water x specific heat H2O x (Tfinal-Tinitial)] + [mass cool water x specific heat H2O x (Tfinal-Tinitial)] - q from ...
*Saturday, May 25, 2013 at 12:23pm by DrBob222*

**CHEMISTRY**

A 2.75 g sample of the hydrocarbon acetone, CH3COCH3, is burned in a bomb calorimeter with 975 mL of water, initially at 23.50 degrees celsius. The bomb is constructed of 285.0 g of nickel metal having a specific heat capacity of Cp = 0.826 J/ g degrees C. The final ...
*Sunday, September 30, 2007 at 10:37pm by Jake*

**Chemistry**

An ice cube at 0 degrees Celsius was dropped into 30.0g of water in a cup at 45 degrees Celsius. At the instant that all of the ice was melted, the temperature of the water in the cup was 19.5 degrees Celsius. What was the mass of the ice cube?
*Friday, April 23, 2010 at 5:57pm by Help1001*

**chemistry URGENT (1)**

What mass (in grams) of CaCl2(s) must be dissolved in pure water at 10.0 deg Celsius to make a 26.4 mL solution and to increase the solution temperature to 16.4 deg Celsius? Assume that there is no heat loss from the solution and that the solution has the same physical ...
*Sunday, November 16, 2008 at 2:18pm by Anonymous*

**chemistry**

200. g of a nonelectrolyte is dissolved in 1.00 kg of water. the boiling point of the solution is then measured to be 101.5 degrees C. What is the molar mass of the compound? The Kb for water is 0.51 degrees Celsius/m
*Monday, June 7, 2010 at 11:07am by Christina*

**chemistry**

200. g of a nonelectrolyte is dissolved in 1.00 kg of water. the boiling point of the solution is then measured to be 101.5 degrees C. What is the molar mass of the compound? The Kb for water is 0.51 degrees Celsius/m
*Monday, June 7, 2010 at 11:07am by Christina*

**Chemistry**

An unknown substance has a mass of 16.3 g. The temperature of the substance increases by 20.1 degrees Celsius when 126 J of heat is added to the substance. What is the most likely identity of the substance? The table lists the specific heat capacities of select substances. ...
*Tuesday, October 9, 2012 at 11:18pm by Anonymous*

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