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April 25, 2014

Search: How much heat is required to warm 1.60 kg of sand from 20.0^\circ C to 100.0 ^\circ {\rm C}?

Number of results: 31,678

Physics
A small electric immersion heater is used to boil 191.0 g of water for a cup of instant coffee. The heater is labeled 355.0 W, which means that it converts electrical energy to heat at this rate. Calculate the time required to bring this water from 12.0C to the boiling point ...
Friday, March 21, 2008 at 8:42am by Courtney

Physics
A small electric immersion heater is used to boil 191.0 g of water for a cup of instant coffee. The heater is labeled 355.0 W, which means that it converts electrical energy to heat at this rate. Calculate the time required to bring this water from 12.0C to the boiling point ...
Tuesday, March 25, 2008 at 8:19am by Josh G.

chemistry
The use of the British thermal unit (Btu {\rm Btu}) is common in much engineering work. (1 Btu {\rm Btu} = 1054J {\rm J}) A Btu {\rm Btu} is the amount of heat required to raise the temperature of 1 lb {\rm lb} of water by 1 ∘ F ^\circ {\rm F}. How many quads of energy ...
Monday, October 7, 2013 at 11:31pm by Anonymous

physics
How much heat in KJ is needed to change 3.0 kg of ice at -10C into (superheated) steam at +150C ? Do I need to find specific heat? (3.0kg)(2100)(150-10)= 882kj right?
Friday, April 22, 2011 at 1:20pm by DMITRIC

Physical Science
Hello, Can some one tell me if I came to the correct answer... Thank You For coal- 0.314 How much heat energy is required to raise the temperature of 5 kilograms of coal from 20 degrees celsius to 220 degrees celcius? my answer: 1,314,718 J
Friday, February 8, 2008 at 8:43pm by Mandi

Chemistry
If 1.22 grams of magnesium reacts with 100 ml of 6.02 M HCl solution. How much heat is evolved? Density of the HCl solution is 1.10 g/ml. Assume the specific heat of water 4.184 J/gC is the specific heat of the solution. Mg + 2 HCl MgCl2 + H2
Tuesday, July 17, 2012 at 12:33am by Anonymous

Chemistry
A chemist mixes 100ml of H2O at 30 degrees Celsius and 56.0g of CaOin a calorimeter. The following reaction occurs" CaO(s) +H2O(l)--->Ca(OH)2(s) ΔH= -16.0 kcal/mol The heat capacity Ca(OH)2(s) is 19.2 cal/mol*degreeCelsius and the heat of vaporization of water is 540 ...
Sunday, March 27, 2011 at 5:23am by Kim

Chemistry
Use Hess's Law to find the change in heat of 2C(graphite)+H2(g)-->C2H2(g)? Given: C(graphite) + O2(g) --> CO2(g) change of heat rxn = -393.5 kJ 2H2 (g) + O2(g) ---> 2H2O (l) change of heat rxn = -571.6 kJ 2C2H2 (g) +5O2(g) ----> 4CO2(g) +2H2O (l) change of heat rxn...
Sunday, May 5, 2013 at 10:54pm by Lauren

college chem
How much heat is absorbed by the calorimeter if the temperature change is 8 C and the calorimeter constant (Heat Capacity) is 3.3 J/K? Your Answer:
Monday, March 8, 2010 at 10:18pm by debra

Tennessee State University
How much heat is absorbed by the calorimeter if the temperature change is 12 C and the calorimeter constant (Heat Capacity) is 3.3 J/K?
Sunday, March 21, 2010 at 1:32pm by Aaron

Tennessee State University
How much heat is absorbed by the calorimeter if the temperature change is 12 C and the calorimeter constant (Heat Capacity) is 3.3 J/K?
Sunday, March 21, 2010 at 2:09pm by Aaron

Tennessee State University
How much heat is absorbed by the calorimeter if the temperature change is 12 C and the calorimeter constant (Heat Capacity) is 3.3 J/K?
Sunday, March 21, 2010 at 5:01pm by Aaron

Chemistry
The density of a 1.0 M solution of NaCl is 1.04 g/mol and its specific heat, c, is 3.60 J/C*g. How much heat is absorbed by 31.4 mL of this solution if the temperature rises from 18.6 C to 29.7 C?
Tuesday, October 19, 2010 at 5:28pm by Sarah

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
the temperature of a 20.0g sample of a metal(specific heat .03 J/g-C) is raised by 20C. How much heat has been absorbed by the metal?
Wednesday, July 13, 2011 at 6:55pm by matt

Physics
if the specific heat of aluminum is 0.21 cal/g degree C, how much heat is givin off when 10 grams of aluminum is cooled from .50 to .10 degress
Sunday, July 11, 2010 at 5:40pm by Jasper

Chem
How much heat will be produced when 16grams of C2H6 burns? The reaction is 2 C2H6 + 7 O2 --> 4CO2 + 6 H20 triangle heat = -350kJ
Tuesday, April 26, 2011 at 11:08pm by Laura

Chemistry
The specific heat of solid gold is 0.13 J/g C. How much heat is needed to raise the temperature of 25.0 g of gold from 23C to its melting point at 1063C?
Friday, November 29, 2013 at 4:33pm by Rae

chemistry
How much heat is needed to raise the temperature of 75 grams of copper from 35aC to 57aC? The specific heat of copper is 0.385 J/g aC.
Wednesday, December 7, 2011 at 11:04pm by mario

chemistry
How much heat is needed to raise the temperature of 75 grams of copper from 35aC to 57aC? The specific heat of copper is 0.385 J/g aC.
Wednesday, December 7, 2011 at 11:05pm by mario

chemistery
How much heat, in joules and calories, is needed to heat up 295 mL of water from 26.6 C to 85.1 C? Assume the density of water to be 1.00 g/mL.
Sunday, March 24, 2013 at 5:10pm by dug

physics
Consider a room air conditioner using a Carnot cycle at maximum theoretical efficiency and operating between the temperatures of 19.7C (indoors) and 28.7C (outdoors). For each 1.00 J of heat flowing out of the room into the air conditioner a) How much heat flows out of the ...
Tuesday, December 18, 2012 at 3:11pm by helena

chemistry
A metal ring with a mass of 18.36 g undergoes a change in temperature of 26.37 oC. The energy change, or heat, required for this change in temperature is 1508 Joules. What is the specific heat of the ring?
Sunday, September 23, 2012 at 8:58pm by Mary

calc/physics
A force of 250 N is required to stretch a spring 5m from rest. Using Hooke's law, F=kx, how much work, in joules, is required to stretch the spring 7m from rest? The energy required scales with x^2. Multiply 250 J by (7/5)^2.
Monday, April 23, 2007 at 3:46pm by Mischa

science
The density of a 1.0 M solution of NaCl is 1.04 g/mL and its specific heat, c, is 3.06 J/C*g. How much heat is absorbed by 3.14 mL of this solution if the temperature rises from 18.6C to 29.7C? q=m*C*delta T (1.04g)(3.06)(11.1K)=35.32 is that right?
Thursday, October 22, 2009 at 6:30pm by megan

Chem
How much heat do I need to convert 200g of liquid water at -25C to water at 30C?. The specific heat capacity of H2O(s) is 2.1 J g*C
Monday, February 28, 2011 at 5:48pm by diana

science
the specific heat of sliver is 0.235j /g.c. how much heat is neeeded to raise the tempreature of an 8 gram sliver ring be 50 degrees celecius
Tuesday, March 1, 2011 at 4:18pm by nikita

Pre Chem
How much heat will be produced when 16grams of C2H6 burns? The reaction is 2 C2H6 + 7 O2 --> 4CO2 + 6 H20 triangle heat = -350kJ
Wednesday, April 27, 2011 at 8:39am by Laura

math
A solar home contains 3.50 multiplied by 105 kg of concrete (specific heat = 1.00 kJ/kgK). How much heat is given off by the concrete when it cools from 29 to 20C?
Tuesday, November 13, 2012 at 9:20pm by Adam

Physics
Spent steam from an electric generating plant leaves the turbines at 120.0 degrees Celsius and is cooled to 90.0 degrees Celsuius liquid water by water from a cooling tower in a heat exchanger. How much heat is removed by the cooling tower water for each kilogram of spent ...
Tuesday, November 21, 2006 at 4:37pm by Erica

chemistry
How much heat is absorbed by the calorimeter if the temperature change is 8C and the calorimeter constant (Heat Capacity) is 3.3 J/K?
Monday, March 31, 2008 at 10:26pm by depressed

chemistry
How much heat is absorbed by the calorimeter if the temperature change is 8 C and the calorimeter constant (Heat Capacity) is 3.3 J/K?
Monday, March 8, 2010 at 10:08pm by debra

chemistry
How much heat is absorbed by the calorimeter if the temperature change is 8 C and the calorimeter constant (Heat Capacity) is 3.3 J/K?
Friday, June 18, 2010 at 10:45pm by tsu

chemistry
How much heat is absorbed by the calorimeter if the temperature change is 10 C and the calorimeter constant (Heat Capacity) is 3.3 J/K?
Thursday, November 3, 2011 at 12:33am by Ashley

chemistry
the heat of vaporization of water is 2.26kJ/g. how much heat is needed to change 2.55 g of water to steam?
Friday, April 20, 2012 at 9:31pm by Randy

chemistry
the heat of vaporizaton of water is 2.26kJ/g. How much heat is needed to change 4.2 g of water to steam.
Tuesday, April 24, 2012 at 9:58pm by Randy

Phase Changes
The heat of vaporization of water is 2.26 kJ/g. How much heat is needed to change 3.74 g of water to steam?
Tuesday, May 7, 2013 at 9:03pm by Jenny

physical chemistry
1.) Calculate delta rH for the freezing of water at one bar and -10 degrees C. The heat capacities are H2O(s)=36.9 JK-1mol-1 and H2O(l)=74.5JK-1mol-1. delta H for freezing of water at 0 degree C is -6602Jmol-1 (assume C is independent of temperature). 2.) Assume the hot brick ...
Tuesday, February 21, 2012 at 5:03pm by nicole

science
The specific heat of solid gold is 0.13J/gC.How much heat is needed to raise the temperature of 25.0g of gold from 23C to its melting point at 1063C
Friday, July 15, 2011 at 11:30pm by Toni

chemistry
How much heat (in cal) is necessary to heat 27.0 mL of octane (s= 0.526 cal/g C ; d = o.703 g/mL ) from 50.6 C to 67.2 C? I understand the Delta T is = 16.6C But I dont know what d stands for (density) or how to apply to the formula.
Sunday, February 3, 2013 at 2:06pm by Joseph

science
How much heat is absorbed when 52.3 g H2O(l) at 100C and 101.3 kPa is converted to steam at 100C? (The molar heat of vaporization of water is 40.7 kJ/mol.)
Thursday, June 27, 2013 at 10:46am by michael

math
Problem The latent heat of fusion (solid become liquid) for ice is 79.8 cal/gram. How much ice can we melt with 1000 calories of heat? Problem Which would require more heat, melting 500 g of 0 C ice or turning 500 g of 100 C water into steam? Problem A 500 g sample of an ...
Monday, October 6, 2008 at 6:39pm by sherri

chemistry
2.) How much heat must be absorbed at 1357 K to melt a bar of copper (80 * 10 * 12 cm) assume d = 8.93 g/cm^3. The normal boiling point is 1357 K, and heat of fusion is 13.05 KJ/mol.
Monday, February 15, 2010 at 9:11pm by Andrew

CHEM
How much heat is released in the formation of 10 liters of NH3(g) at 25 C and 1 atm, given : 2N2+3H2 ----> 2 NH3 HEAT OF FUSION IS - 92.6 KJ show steps please
Thursday, November 18, 2010 at 7:34pm by MAX

Physics
My problem is as follows "A 3 kg brick is dropped from a height of 1.0 m onto a nail which is vertically stuck in a plank of wood. If the nail doesn't move in much, how much heat is produced in the system when the brick hits and sticks onto the top of the nail." I know PE is ...
Thursday, April 16, 2009 at 4:51pm by Brigid

Physics
If the air temperature is the same as the temperature of your skin (about 30 degrees Celcius), your body cannot get rid of heat by transferring it to the air. In that case, it gets rid of the heat by evaporating water (sweat). During bicycling, a typical 71.0 kg persons body ...
Friday, November 21, 2008 at 12:29am by Angel

Heat & Properties of Matter
A rail way 50m long, with initial temperature of 20degree celsius subjected to a great heat. How much will it expand which its temperature is tripled?
Sunday, October 18, 2009 at 6:56am by Beta plus

physics
How much heat must be added to 0.55 kg of aluminum to change it from a solid at 180C to a liquid at 660C (its melting point)? The latent heat of fusion for aluminum is 4.0 105 J/kg.
Friday, December 10, 2010 at 4:00pm by maria

Physics
A reversible heat engine operates between thermal reservoirs at 1000 K and 290 K. If 8610 J is extracted from the hot reservoir, how much work is done by the heat engine?
Friday, December 9, 2011 at 6:13pm by Jon

Chemistry
Can someone please explain how to solve this problem. Thank you very much. A chunk of silver has a heat capacity of 42.8 J/degrees C. If the silver has a mass of 181 grams, calculate the specific heat of silver. Heat capacity is 42.8 J/C for 181 g. What you want is for 1 g. So...
Thursday, July 19, 2007 at 4:28pm by Allyssa

chemistry
How much energy must be put into a system to raise 100 g of solid water from 5.5 degrees Celsius to 75 Degrees Celsius? Heat Capacity of Ice: 2.09 J/g degrees C Heat Capacity of Water: 4.18 J/g degrees C Heat of Fusion: 6.01 kJ/mol
Friday, June 17, 2011 at 1:15am by Britney

chemistry
During a strenuous workout, a student generates 2000 kJ of heat energy. What mass of water would have to evaporate from the student's skin to dissipate this much heat?
Tuesday, October 26, 2010 at 12:25am by Brittney

chemistry (combustion and heat)
How much heat is evolved when 5.00g of propane C3H8 burns completely. I got the formula down, now what? C3H8 + 5O2 -> 3CO2 + 4H2O
Saturday, November 20, 2010 at 11:33pm by Anonymous

Chemistry HELP!!
During a strenous workout, an athlete generates 1890.0 kj of heat energy. What mass of water would have to evaporate from the athlete's skin to dissipate this much heat?
Thursday, March 24, 2011 at 11:47am by Toni Jones

Chemistry
During a strenous workout, an athlete generates 1890.0 kj of heat energy. What mass of water would have to evaporate from the athlete's skin to dissipate this much heat?
Thursday, March 24, 2011 at 5:12pm by Toni Jones

Chemistry
During a strenous workout, an athlete generates 1890.0 kj of heat energy. What mass of water would have to evaporate from the athlete's skin to dissipate this much heat?
Thursday, March 24, 2011 at 8:28pm by Toni Jones

Chemistry
Answer the following questions based on 2NH3->N2+3H2+450Joules How much heat is released in the equation: 6NH3->3N2+9H2 What is the heat of the reaction: H2+1/3N2->2/3NH3
Saturday, March 31, 2012 at 4:20pm by JR.

physics
got 22 degrees celsius for the last answer from Damon. Another question is ......How much heat is needed to raise the temperature of a 500g object with specific heat capacity 0.5 cal/g c by 25 degrees?
Sunday, June 17, 2012 at 5:36pm by tony

physics
A 250-g block of ice is removed from the refrigerator at 􏰀8.0C. How much heat does the ice absorb as it warms to room temperature (22C)? The heat of fusion of water is 3.34􏰁105 J/kg.
Friday, December 7, 2012 at 12:07am by yasir

Chemistry
How much heat is emitted when 4.55 of water condenses at 25 ? The heat of vaporization of water at 25 is 44.0 .
Thursday, April 14, 2011 at 11:07pm by Tany

chemistry
How much heat is emitted when 4.55 of water condenses at 25 ? The heat of vaporization of water at 25 is 44.0
Sunday, October 2, 2011 at 6:59pm by Anonymous

Chemistry Help!!
How many joules of heat are required to melt 60.5g of ice at 0 degrees C?
Wednesday, October 12, 2011 at 2:26pm by Maci

phys
How many kcal of heat are required to vaporize 25.0 kg of water at 100C?
Thursday, December 15, 2011 at 4:08pm by Dennis

Chemistry
What amount of heat is required to raise the temperature of 10.0 g of aluminum by 15.0 C
Wednesday, February 8, 2012 at 10:35pm by Olga

Chemistry
What amount of heat is required to raise the temperature of 10.0 g of aluminum by 15.0 C
Wednesday, February 8, 2012 at 10:35pm by Olga

physics
how many Btu of heat are required to melt 8.35 lb of ice at 32 degrees F
Wednesday, April 9, 2014 at 9:30am by nick

Science
Chemistry! So a metal is found to absorb 1000 calories as it is heated from 40.0C to 60.0C. How much heat would the same sample absorb if it were heated from 60.0C to 80.0C? I know I'm supposed to use the equation Q=s x m x delta t (or soemthing) Q= energy absorbed s= specific...
Monday, January 14, 2013 at 10:39pm by Ari

Chemistry
density- 0.818g/mL boiling point- 78.5 degrees C heat of vaporization- 210cal/g a)How much energy, in calories, will be required to evaporate 125.0 mL of ethanol at its boiling point? b)How long will it take to add this energy, if the rate of heating is 1.24kcal/minute? Please...
Tuesday, September 1, 2009 at 10:41pm by Dana

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

physics
How much heat in joules must be added to 0.348 kg of aluminum to change it from a solid at 138 C to a liquid at 660 C (its melting point)? The latent heat of fusion for aluminum is 4.0 x 105 J/kg.
Tuesday, May 15, 2012 at 4:29am by RM

Chemistry
A quantity of ice at 0.0 degrees C was added to 33.6 of water at 21.0 degree C to give water at 0.0 degrees C. How much ice was added? The heat of fusion of water is 6.01 kJ/mol and the specific heat is 4.18 J/(g * degrees C) q = mass x specific heat x delta T? q = mass x heat...
Monday, February 4, 2008 at 12:52pm by Lauren

Chemistry!
Hey jiskha. Microwave ovens emit microwave radiation that is absorbed by water. The absorbed radiation is converted to heat that is transferred to other components of the food. Suppose that the microwave radiation has a wavelength of 12.7 cm. How many photons are required to ...
Sunday, November 14, 2010 at 4:54pm by Alex

Calculus
A spring has a natural length of 24 cm. If a 27-N force is required to keep it stretched to a length of 30 cm, how much work W is required to stretch it from 24 cm to 27 cm? (Round your answer to two decimal places.)
Sunday, December 4, 2011 at 5:45am by Courtney

chemistry
Propane gas is used to heat a tank of water. If the tank contains 200 L of water, what mass of propane will be required to raise its temperature from 20 degrees C to 65 degrees C. The heat of combustion for propane is -2220 kJ/mol.
Thursday, November 4, 2010 at 10:01pm by Ray

Physics
Consider an inefficient engine which draws 200 J of heat from a hot reservoir at 100oC, converts 48 J to work, and rejects 152 J to a cold reservoir at 0oC. Theoretically, how much maximum work can be produced if the efficiency of the engine is maximized? How much work was ...
Wednesday, October 6, 2010 at 7:27am by Andrea

Physics
Consider an inefficient engine which draws 200 J of heat from a hot reservoir at 100oC, converts 48 J to work, and rejects 152 J to a cold reservoir at 0oC. Theoretically, how much maximum work can be produced if the efficiency of the engine is maximized? How much work was ...
Thursday, October 7, 2010 at 4:19am by Angel

Physics
Consider an inefficient engine which draws 200 J of heat from a hot reservoir at 100oC, converts 48 J to work, and rejects 152 J to a cold reservoir at 0oC. Theoretically, how much maximum work can be produced if the efficiency of the engine is maximized? How much work was ...
Thursday, October 7, 2010 at 4:23am by Angel

Physics
Consider an inefficient engine which draws 200 J of heat from a hot reservoir at 100oC, converts 48 J to work, and rejects 152 J to a cold reservoir at 0oC. Theoretically, how much maximum work can be produced if the efficiency of the engine is maximized? How much work was ...
Thursday, October 7, 2010 at 4:27am by Angel

Physics
Consider an inefficient engine which draws 200 J of heat from a hot reservoir at 100oC, converts 48 J to work, and rejects 152 J to a cold reservoir at 0oC. Theoretically, how much maximum work can be produced if the efficiency of the engine is maximized? How much work was ...
Thursday, October 7, 2010 at 5:05am by Angel

chem!!
what determines if the heat of solution is endothermic or exothermic for salts? Mostly the competition between the lattice energy (how much energy it takes to break the crystalline strucure) vs the heat of solvation of the ions.
Wednesday, April 25, 2007 at 8:20pm by Anonymous

physics
The engine of a large ship does 2.05 multiplied by 108 J of work with an efficiency of 4.00%. (a) How much waste heat (J) is produced? (b) How many barrels of fuel are consumed, if each barrel produces 6.00 multiplied by 109 J of heat when burned?
Wednesday, July 24, 2013 at 9:53pm by Eric

physics
A 0.75 kg mass of copper changes temperature from 145.0 C to 46.0 C. How much heat was exchanged in Joules? Did the heat flow into the copper or out of the copper?
Thursday, January 26, 2012 at 1:45pm by mario

More chemistry
Hey jiskha. Microwave ovens emit microwave radiation that is absorbed by water. The absorbed radiation is converted to heat that is transferred to other components of the food. Suppose that the microwave radiation has a wavelength of 12.7 cm. How many photons are required to ...
Sunday, November 14, 2010 at 3:39pm by Alex

physics
The recovery time of a hot water heater is the time required to heat all the water in the unit to the desired temperature. Suppose that a 62-gal (1.00 gal = 3.79 x 10-3 m3) unit starts with cold water at 11 C and delivers hot water at 53 C. The unit is electric and utilizes ...
Monday, February 18, 2013 at 12:30am by Anonymous

Physics
The recovery time of a hot water heater is the time required to heat all the water in the unit to the desired temperature. Suppose that a 62-gal (1.00 gal = 3.79 x 10-3 m3) unit starts with cold water at 11 C and delivers hot water at 53 C. The unit is electric and utilizes ...
Monday, February 18, 2013 at 6:49pm by Anonymous

chemistry
What quantity of heat is required to vaporize 32.5 g of liquid water at 100C?
Tuesday, February 16, 2010 at 6:24pm by Emily

chemistry
What quantity of heat is required to warm 53.7 g of liquid water from 0C to 100C?
Monday, March 29, 2010 at 11:14pm by rachel

Physics
How many kcal of heat are required to vaporize 25.0kg of water at 100C?
Monday, April 2, 2012 at 12:22pm by Madison

physics
A piston-cylinder assembly with the piston resting on a set of stops, contains 0.5 Kg of He gas intially at 100kPa and 25C. The mass of the piston and the effect of the atmospheric pressure is such that a pressure of 500kPa is required to raise it. How much energy must be ...
Monday, September 29, 2008 at 10:56am by Nayi

Chemistry
Thank you very much. I needed help with one more. A bomb calorimeter evolves 4.66 kJ of heat. If the heat capacity of the calorimeter is 1.38 kJ/Celsius, what is the temp change of the calorimeter? I thought it may be 4.66/1.38= 3.38?
Monday, April 5, 2010 at 12:14pm by Danielle

Chemistry
How much heat is lost when 12.4 g of H2O g at 110 degrees C are converted to liquid at 50.0 degrees C? (The specific heat of steam is 2.02 J/g degrees C. Could someone write the steps? Equation?
Monday, May 24, 2010 at 11:29pm by Anonymous

science
gold has a specific heat of 0.130j/g. degrees celcuis if 195 joules of heat are added to 15 grans of gold homw much does the tempreature of the gold change
Tuesday, March 1, 2011 at 4:21pm by nikita

Chemistry
I have to solve this combustion problem using Dimensional Analysis and molar heat: 2 C2H6 +7O2 yields 4 CO2 + 6H2O + 3120 kJ The question is to discover how much heat is produced along with 8 moles of water in this reaction. My problem is that I have no idea how to go about ...
Wednesday, June 3, 2009 at 7:54pm by Narasaq

chemistry
How much heat (in Joules) is gained by the water when a chemical reaction takes place in 100.0 ml aqueous solution, has a temperature increase of 10.20C and a specific heat capacity of 4.180 J/Cg? [Hint: ignore any effects of the calorimeter and solve for qwater]
Monday, March 31, 2014 at 9:44pm by shelle

chemistry 121
Microwave ovens use microwave radiation to heat food. The microwaves are absorbed by moisture in the food, which is transferred to other components of the food. As the water becomes hotter, so does the food. Suppose that the microwave radiation has a wavelength of 11.2 . How ...
Friday, March 26, 2010 at 3:21pm by andrea

Chemistry
(a) A 102-g sample of water is placed in an insulated container and allowed to come to room temperature at 21C. To heat the water sample to 41C, how much heat must you add to it? kJ (b) Consider the hypothetical reaction, being run in an insulated container that contains 102...
Tuesday, June 7, 2011 at 8:25am by Lance

Science
1). Assume the following: -the house has 2,000 square feet -80,000 BTU's of heat per sq. foot are required to heat the house for winter. -Natural gas is available at a cost of $5.00 per thousand cubic feet. -One cubic foot of natural gas supplies 1,000 BTUs of heat energy -The...
Monday, March 21, 2011 at 8:34pm by Danielle

physics
A box with a volume V = 0.03 m^3 lies at the bottom of a lake whose water has a density of 103 kg/m^3. (a) How much force is required to lift the box, if the mass of the box is 100 kg? (b) How much force is required to lift the box, if the mass of the box is 70 kg?
Tuesday, November 27, 2012 at 1:43pm by lisa

chem
HOw much energy is required to heat 36.0g H2O from a liquid at 65C to a gas at 115C? The following physical data may be uselful. Hvap=40.7kJ/mol C liquid=4.18 C gas=2.01 C solid= 2.09 T melting=0 C T boiling=100 C The answers about 87.7 kJ However I'm not sure how you get this...
Sunday, May 11, 2008 at 3:55am by natash

physics
While taking a plane flight to a meeting, a physicist decides to do a mental calculation of how much fuel the plane would consume in the absence of friction, assuming its engines have an efficiency of 22.0% and the mass of the plane is 200,000 kg. Each gallon of jet fuel ...
Thursday, July 25, 2013 at 10:15pm by Justin

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