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February 8, 2016

# Search: How much heat in kcal must be added to 0.52 kg of water at room temperature (20&deg;C) to raise its temperature to 37&deg;C?

Number of results: 74,489

Chemistry
How mucyh heat is given up when 20 g of steam at 100 deg C is condensensed and cooled to 20 deg. C?
February 23, 2010 by Ally

Chemistry
Calculate the heat (in kJ) required to change 40.0g of ice at -30.0 deg C to steam at 150.0 deg C?
March 6, 2012 by Caitlin

Specific Heat
How many Btu of heat must be added to 1200 lb of copper to raise its temperature from 100°F to 450°F
November 3, 2014 by Justin

Science
I conducted an experiment of the heat of combustion for three alcohol fuels, methyl, propyl and ethyl. The results were: Methyl - mass before was 231.81g temp of water before heating was 15 deg c. temp of water after heating was 40 deg c. mass of methyl after heating 229.92g ...
November 8, 2010 by Paul

physics(heat)
A geyser heats water flowing at the rate of 3L/min from 27 deg C to 77 deg C. if the geyser operates on a burner, what is the rate of combustion of the fuel if its heat of combustion is 40000J/g?
May 29, 2012 by ridhi

physics(heat)
A geyser heats water flowing at the rate of 3L/min from 27 deg C to 77 deg C. if the geyser operates on a burner, what is the rate of combustion of the fuel if its heat of combustion is 40000J/g?
May 29, 2012 by ridhi

physcial science
When 1 kg of ice at 0 degrees Celsius absorbs 80 kilocalories of heat, the ice undergoes a) a change of state b) a loss of energy c) a rise in temperature d) an increase in volulme The heat of fusion of water is 80 kcal/kg. That means that 1 kg of ice will melt if it absorbs ...
June 22, 2007 by daniel

PHYSÝCS
Suppose a person metabolizes 2150 kcal/day. a) With a core body temperature of 37.1°C and an ambient temperature of 21.3°C, what is the maximum (Carnot) efficiency with which the person can perform work? b) If the person could work with that efficiency, at what rate, in watts...
January 6, 2012 by melisa

physics
Suppose a person metabolizes 2250 kcal/day. a) With a core body temperature of 36.9°C and an ambient temperature of 21.5°C, what is the maximum (Carnot) efficiency with which the person can perform work? b) If the person could work with that efficiency, at what rate, in watts...
December 18, 2012 by helena

pre-cal
Find the EXACT VALUE of csc(-11pi/12) If that angle is in radians, it is easy. A full circle has 2PI radians...or 360 deg so 22PI/24 is the same as 22*15 deg, or -30 deg. The 30 deg triangle is well known. The sin is 1/2, so the csc is 2 Figure out the sign of the csc from ...
May 16, 2007 by ethan

Physics
A pond with a flat bottom has a surface area of 820 m^2 and a depth of 2.0m. on a warm day, the surface water is a temperature of 25 deg C, while the bottom of the pond is at 12 deg C. Find the rate at which energy is transferred by conduction from the surface to the bottom of...
November 18, 2012 by R

Chemistry
A person falls in water at 0 degrees C. After 20 minutes of exposure, they are suffering acute hypothermia, as their core body temperature has dropped to 30.0 degrees C. Assume that a person’s heat capacity can be approximated by the heat capacity of water, 4.18 J/g/oC. The ...
November 20, 2007 by Raj

chemistry
calculate the energy, in joules and calories required to heat 25.0g of water form 12.5 deg. celcius to 25.7 deg. celcius i know the answer just need to see how to do it especially the calories
January 22, 2012 by shaun

chemistry
Can specific heat be negative? I know energy can be (as in joules or calories) because when something cools down the temperature difference is a negative, and because the energy is an important part of the formula for specific heat, couldn't it be negative? Specific heat ...
October 22, 2006 by Fido

Physics
How much heat must be added to 30 g of water at an initial temperature of 62°C to completely convert the 100°C water to steam?
March 30, 2012 by Tiffany

physics
A 0.250-kg aluminum bowl holding 0.800 kg of soup at 27.0°C is placed in a freezer. What is the final temperature if 430 kJ of energy is transferred from the bowl and soup? Assume the soup has the same thermal properties as that of water, the specific heat of the liquid soup ...
April 21, 2014 by logan

Heat Transfer
A metal storage tank of external area 0.5 m^2 contains water at 65 degree C. & is located inside a large enclosure with wall at 10 deg.C. the tank is painted black on the outside & its emissivity is approx. to 0.95. How much reduction in heat loss would occur if the outside ...
August 1, 2012 by Dhilsath

Physics
I have a few physics questions that I don't understand. Two are thermal expansion problems and the other is an ideal gas law problem. 1. Two rods, one made of iron and the other of aluminum, have the same initial length at 64.00 deg. C? When the temperature drops to 4.00 deg. ...
February 8, 2016 by Alyssa

Physics
A class of 11 students taking an exam has a power output per student of 124 W. Assume that the initial temperature of the room is 18.7°C and that its dimensions are 6.00 m by 14.5 m by 3.40 m. What is the temperature (in °C, do not enter units) of the room at the end of 55.0 ...
February 9, 2011 by Kelsey

chemistry
how much heat, in kilojoules, must be added to 178 grams of water to increase the temperature of the water by 50 degrees celisus?
April 21, 2010 by ch

chemistry
The heat lost or gained by a system is related to its temperature change by a property called its heat capacity. The molar heat capacity of metals at or above room temperature equals 24.92 J/K.mol. The temperature of a block of lead (MM 207.2) was raised by 13.1 degrees when ...
September 25, 2014 by korko

physics
Consider four vectors F1, F2, F3, and F4, with magnitudes are F1 = 41 N, F2 = 24 N, F3 =27 N, and F4 = 51 N, and angle 1 = 150 deg, angle 2 = −160 deg, angle 3 = 39 deg, and angle 4 = −57 deg, measured from the positive x axis with the counter clockwise angular ...
February 16, 2011 by anonymous

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

chemistry
If 125cal of heat is applied to a 60.0-g piece of copper at 20.0(Deg C), what will the final temperature be? The specific heat of copper is 0.0920cal/(g.degC)
February 16, 2013 by Anonymous

Physics Component Method
The vector signs are above each letter (I just don't know how to show it that way) A= 145 units @ 190 deg. B= 75 units @ 288 deg. C= 210 units @ 85 deg. D= 105 units @ 355 deg. How do I use the component Method with these given magnitude and degree???
January 12, 2016 by ANON

thermal energy
A hot 0.25-kg piece of iron is placed in a calorimeter containing room temperature water. How much heat is lost by the iron as it cools from 125 degree C to 75 degree C? I must have the given/work and answer also how much heat is gained by the water
December 19, 2011 by faith

thermochem
A meal is 8000kJ. If all the energy is converted to heat, how much iced water with a temperature of 0 degrees must a person drink to maintain body temperature of 37 degrees? How do I solve this - using the fact that 1mL water by 1 degree is 4.2Joules? Heat gained by water = ...
February 6, 2012 by Cole

PHYSICS
Q1= An 85 cu.meter room. - How much energy required to heat room temperature from 5C to 22C. - How long in minutes Q2= - a 40 Liter radiator in the same room above. energy input is 5400 watts. In order to increase room temperature from 5C to 22C, how long 5400 Watts will be ...
May 31, 2012 by M BIL

chemistry
A sealed flask contains 0.40 g of water at 28 deg. celsius. The vapor pressure of water at this temperature is 28.36 mmHg
September 6, 2009 by jeff

Physics
How much (in Celsius degrees) is the temperature of 1.3 kg of alcohol raised by adding 4.1 kcal of heat? The following piece of information may come in handy: specific heat of alcohol is 0.58 kcal/kgC.
January 17, 2014 by Randall

Physics
How much (in Celsius degrees) is the temperature of 1.3 kg of alcohol raised by adding 4.1 kcal of heat? The following piece of information may come in handy: specific heat of alcohol is 0.58 kcal/kgC.
January 31, 2014 by Chelsea

Physics
How much (in Celsius degrees) is the temperature of 1.3 kg of alcohol raised by adding 4.1 kcal of heat? The following piece of information may come in handy: specific heat of alcohol is 0.58 kcal/kgC.
February 3, 2014 by Riley

science
If you have 10 lbs shrimp at 80 deg F how much ice would it take to reach 50 deg F in 10 minutes?
August 7, 2013 by bill

Chemistry
Heat energy is added to a 325 g block of nickel, and the temperature increases from 23 degrees celsius to 51 degrees celsius. If the same amount of heat was added to the same mass of water at the same temperature, what would the water's final temperature be?
September 12, 2013 by Bre

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...
March 3, 2014 by Anonymous

chemistry
The heat of fusion of water is 335 J/g, the heat of vaporization of water is 2.26 kJ/g, and the specific heat of water is 4.184 J/deg/g. How many grams of ice at 0 ° could be converted to steam at 100 °C by 9,946 Joules of heat?
November 15, 2013 by Dakota

Science Physics
How many Btu of heat must be added to 1200 lb of copper to raise its temperature from 100°F to 450°F
November 3, 2014 by Justin

thermal energy
how much heat must be absorbed by a 500 g pot of water to raise the temperature from 20 degree C to 30 degree C?
December 19, 2011 by faith

science
Assuming that radiation with a wavelength = 15.0 cm is used, that all the energy is converted to heat, and that 4.184 J is needed to raise the temperature of 1.00 g of water by 1.00 degree celcius, how many photons are necessary to raise the temperature of a 350 mL cup of ...
July 22, 2011 by Breanna

Physics
How many Btu of heat must be added to 900lbs of steel to raise its temperature from 20.0°F to 500°F? Specific heat of steel .115Btu/lb°F

physics
A class of 11 students taking an exam has a power output per student of 122 W. Assume that the initial temperature of the room is 18.8oC and that its dimensions are 6.40 m by 14.5 m by 3.50 m. What is the temperature of the room at the end of 54.0 min if all the heat remains ...

Physics
During a particular thunderstorm, the elctric potential difference between the clouds and the groud is Vcloud-Vgroud = 10^9 volts with the cloud being at the higher potential. Now, there is a lightning flash in which a charge of -25C is transferred from the ground to the cloud...
January 26, 2010 by Es

Chemistry
An aqueous solution of NaCl freezes at -1.6ºC. At what temperature will it boil? Given that K(b) for water is 0.52 deg m^-1.
April 17, 2013 by steph

chemo
How much heat (in kJ) does it take to melt 28.4 grams of ice at 0 °C and raise the temperature of the resulting water to 25 °C? Heat of fusion 334 J/g, Specific heat 4.184 J/g °C ?
October 29, 2013 by melissa

Science Physics
How many Btu of heat must be added to 1200 lb of copper to raise its temperature from 100°F to 450°F -specific heat for copper is 0.092-
November 4, 2014 by Justin

physics
The same amount of heat entering identical masses of different substances produces different temperature changes. Calculate the final temperature when 1.25 kcal of heat enters 1.25 kg of the following, originally at 20.0°C. (a) water (b) concrete (c) steel (d) mercury
July 19, 2013 by Eric

Physic II
A technician needs to raise the temperature of a 2 kg block of steel from 25 oC to 700 oC in an annealing process. How much energy, in Joules, must be transferred to the steel to produce this temperature rise? Specific heat=448J/kg C
April 17, 2014 by huruney@

chemistry
calculate the theoretical amount of CaCl2 that would be required to change the temperature of 50ml of water from room temperature 20C to 45C? Remember heat loss during the dissolution is equal to the heat capacity of water. this value is 4.184. you assume that the density of ...
October 17, 2010 by Tersa

Chemistry
Calculate the theoretical amount of CaCl2 that would be required to change the temperature of 50ml of water from room temperature 20C to 45C? Remember heat loss during the dissolution is equal to the heat capacity of water. this value is 4.184. you assume that the density of ...
October 19, 2010 by Sarah

Physics - calorie
This was my problem: 4.) The specific heat capacity of copper is 0.092 cal/g*oC. Show that the amount of heat needed to raise the temperature of a 10-g piece of copper from 0oC to 100oC is 92 cal. How does this compare with the heat needed to raise the temperature for the same...
September 20, 2009 by Mary

Chemistry
1) What Physical properties, other than specific heat, could you use to help identify unknown metals? 2) Why is water an excellent material to use in a calorimeter? Density, color, resistivity (or conductitivy), melting point, crystallization. 2) water is excellent because it ...
September 21, 2006 by K.

Chemistry
106 g of iron at 84.0°C are placed in contact with 205 g of silver at 11.0°C. If no heat is lost to the surroundings, what is the final temperature of the metals? The specific heat of iron is 0.418 J/g·°C and that of silver is 0.251 J/g·°C. 92.0 g of a metal at 92.0°C are ...
April 25, 2011 by Becky

Physics
Assume the optimal coffee drinking temperature is 75°C, and further assume coffee has the same heat capacity and density as water. a. How much energy is required to raise the temperature of 1 cup (0.237 liters) of coffee initially at 25°C to the optimal temperature? b. How ...
December 5, 2010 by Steve

Physics => speed of sound variation
The speed of sound in air (m/s) depends on temperature according to aprox expression of v= 331.5 + 0.607 Tc Tc= temp in celcius In dry air, temperature decreases about 1deg celcius for every 150m rise in altitude. a) assume the change is constant up to altitude of 9000 m. What...
February 20, 2008 by ~christina~

Physics
A class of 11 students taking an exam has a power output per student of 122 W. Assume that the initial temperature of the room is 18.8oC and that its dimensions are 6.40 m by 14.5 m by 3.50 m. What is the temperature (in oC, do not enter units) of the room at the end of 54.0 ...
November 11, 2012 by jake

physics
How many calories of heat must be added to 455 g of steel to raise its temperature from 20 °C to 192 °C? (Note: csteel = 0.115 cal./g. °C.)
May 20, 2013 by help please asap

chemistry Ap
How much heat must be added to 50.0g of aluminum metal at 25 degrees C to raise its temperature to 125 degrees C? I have about 20 of these left so if you can do this and work it out and show me how you did it it would be great so I can use it as a guide for the next 19. Thanks.
February 8, 2008 by mhaidar9108

chemistry
A thimbleful of water at 100 deg C has a higher temp than a swimming pool full of water at 20 deg C, but the pool has more thermal energy than the thimble. Explain why this is possbile?
April 26, 2010 by lala

math
A jeweler is heating a gold bar. It takes 7 joules of heat to raise the temperature of the bar 1°C. The initial temperature of the bar is 25°C. Use this information for Items 4–11. 4. Make a table that shows how many joules of heat would be required to raise the temperature of...
September 16, 2015 by sarah

algebra
A jeweler is heating a gold bar. It takes 7 joules of heat to raise the temperature of the bar 1°C. The initial temperature of the bar is 25°C. Use this information for Items 4–11. 4. Make a table that shows how many joules of heat would be required to raise the temperature of...
September 16, 2015 by sarah

math,
A jeweler is heating a gold bar. It takes 7 joules of heat to raise the temperature of the bar 1°C. The initial temperature of the bar is 25°C. Use this information for Items 4–11. 4. Make a table that shows how many joules of heat would be required to raise the temperature of...
September 16, 2015 by sarah

Physical Science
lead has specific heat of .028kcal/kgC, melting point of 328 degrees C and a heat fusion of 5.5 kcal/kg. how much heat must be provided to melt a 250kg sample of lead with a temperature of 20 degrees Celsius?
April 8, 2011 by yolanda

CHEMISTRY
selenium tetrafluoride, SeF4 is a colorless. it has vapor pressure of 757mmhg at 105 deg c and 522mmhg a 95 deg c. what is the vapor pressure of carbon disulfide at 35 deg c?
September 19, 2007 by Del

Science
Why does the temperature remain constant around 0 degrees C and 100 degrees C? For what? For water when it is freezing or boiling? Or do you have another question in mind? Sorry, it's for water when it is freezing or boiling. Think of it this way. Start with a cup of water. ...
January 4, 2007 by Katie

Chemistry
The specific heat of zinc is 0.096 cal/(g °C). Determine the energy required to raise the temperature of 26.1 g of zinc from room temperature (20.0 °C) to 150 °C.
April 3, 2013 by B

Chem
The specific heat of zinc is 0.096 cal/(g °C). Determine the energy required to raise the temperature of 26.1 g of zinc from room temperature (20.0 °C) to 150 °C.
April 4, 2013 by Joel

Physics
How much heat is required to convert solid ice with a mass of 875 g and at a temperature of -11.5 °C to liquid water at a temperature of 52.0 °C? (The specific heat of ice is cice = 2100 J/kgK, the specific heat of water is cwater = 4186.8 J/kgK, and the heat of fusion for ...
April 18, 2015 by Karly

CHEMISTRY
Suppose a sample of hot iron is dropped in a cup of room temperature water. a) what happens to the temperature of the iron & water? b.) in what direction does heat flow occur? c.) when does heat flow stop? d.) assuming no heat is lost to the environment, compare heat gained ...
September 29, 2015 by Emma

Mathematics Ms Sue help
How many calories of heat must be added to 455 g of steel to raise its temperature from 20 °C to 192 °C? (Note: csteel = 0.115 cal./g. °C.)

Phys 2
I am having trouble figuring out this question: Part 1: A long staight wire carries a current due East. This wire creates, at point #1, a magnetic field that is derected at 40 deg below due South. From point #1, the wire is located: 50 deg below due North 50 deg below due ...
March 16, 2011 by Sonia

Physics
I am having trouble figuring out this question: Part 1: A long staight wire carries a current due East. This wire creates, at point #1, a magnetic field that is derected at 40 deg below due South. From point #1, the wire is located: 50 deg below due North 50 deg below due ...
March 16, 2011 by Sonia

Physics
How much heat is required to raise the temperature of 70 g of water from 20 C to 80 C?
January 17, 2011 by Abida

Help me!, Physics
A 60g piece of ice at an intial temperature that is unknown is placed into a glass of 250g of water sitting at room temperature when it is 80 degrees F in the room. The glass and ice come up thermal equilibrium at 4 degrees Celsius. What is the original temperature of the ...
January 15, 2013 by Jazzy

physics
At a picnic, a Styrofoam cup contains lemonade and ice at 0 degree C. The thickness of the cup is 2.0*10^-3m, and the area is 0.016 m^2. The temperature at the outside surface of the cup is 35 degree C. The latent heat of fusion for ice is 3.35*10^5 J/kg. What mass of ice ...
February 21, 2008 by Lydia

Physics
How many grams of ice must be added to 100 grams of water at 60 degrees so that its temperature drops to 20 degrees celcius? As far as i know I have to use: (Mass)*(specific heat of water) *(finaltemperature - initial temperature = ??
January 7, 2010 by Jose

Memt 202
If a rod of 1025 steel 0.5 m (19.7 in) long is heated from 20 to 80 deg C (68 to 176 deg F) while its ends are maintained rigid, determine the type and magnitude of stress that develops. Assume that at 20 deg C the rod is stress free.
November 11, 2010 by alok

Chemistry
It took 400 calories of heat to raise 50 mL of water from 20 degrees Celsius to its final temperature. What was that temperature?
March 14, 2011 by Shambrey

chemistry
Hii i was wondering if u cud help me solve this problem..im not sure how to start it. Calculate the delta H for the reaction of solid potassium with liquid water. If a 5.00 g piece of potassium is added to 1.00 kg of water at 24 degrees celsius what is the final temperature of...
November 5, 2009 by Anmol

Physics - Fluids
A freezer contains 20 kg of food with a specific heat of 2 x 10^3 J/kgC. The freezer motor then operates for 10 minutes reducing the temperature to -8 degrees Celsius. a) How much heat is removed from the food during this time? The freezer motor operates at 400 watts. b) How ...
December 17, 2008 by Peter

college chem
In this experiment a hot metal block at 100oC is added to cold water in a calorimeter. The heat lost by the metal block equals the heat gained by the water and the two end up at the same temperature. In one experiment, the mass of the metal block is 89.5 grams, the volume of ...
October 8, 2009 by Sarah

Chemistry
80.0 mL of water is initially at room temperature (22degrees C). A chilled steel rod at 2 degrees C is placed in the water. If the final temperature of the system is 21.2 degrees C, what is the mass of the steel bar? Specific heat of water = 4.18J/g(degreesC) Specific heat of ...
October 22, 2010 by Ellen

Urgent-Chemistry Help
I need help with the heat effects and calorimetry worksheet. Please explain how to solve it! Thank you so much! A metal sample weighing 45.2g and at a temperature of 100.0 C was placed in 38.6g of water in a calorimeter at 25.6 C. At equilibrium the temperature of the water ...
December 4, 2006 by Tiffany

Chemistry
Mercury, with a freezing point of -38.8°C, is the only metal that is liquid at room temperature. How much heat energy (in joules) must be released by mercury if 1.30 mL of the metal is cooled from room temperature (18.0°C) to -38.8°C and then frozen to a solid? (The density of...
May 25, 2011 by Amalia

I am having trouble figuring out this question: Part 1: A long staight wire carries a current due East. This wire creates, at point #1, a magnetic field that is derected at 40 deg below due South. From point #1, the wire is located: 50 deg below due North 50 deg below due ...
March 16, 2011 by Sonia

chemistry
To raise the temperature of 200.8 g of water from 50.00 °C to 60.00 °C requires how much heat?
February 28, 2013 by jo

phisic
Treating air as an ideal gas of diatomic molecules, calculate how much heat is required to raise the temperature of the air in an 7.47 m by 14.9 m by 2.87 m room from 19.9°C to 21.7°C at 101 kPa. Neglect the change in the number of moles of air in the room

physics
Q.an aluminium can of mass 200gm contains 500gms of water at 50c.an ice cube of mass 50gms,initially at a temperature of -20c is thrown into the can of water. i.what is the final temperature onces the ice metls and comes into equilibrium? ii.now a 200gm piece of Iron whose ...
June 1, 2013 by rosy

chemistry
The reaction between sodium hydroxide and hydrobromic acid is represented in the equation below: OH- + H+ -> H2O A 62.5 mL sample of 1.86 M NaOH at 22.5 deg Celsius was mixed with 62.5 mL sample of 1.86 M of HBr at 22.5 deg Celsius in a coffee cup calorimeter. The ...
November 2, 2014 by lola

physics
A 1.23-kg copper pot contains 2.17 L of water. Both pot and water are initially at 18.3°C. How much heat must flow into the pot and the water to bring their temperature up to 93.1°C? Assume that the effect of water evaporation during the heating process can be neglected and ...
August 8, 2014 by medy

Science
1. How much heat energy is lost by 3 kg of water when it cools from 80 degrees C to 10 degrees C? 2. A 300 g piece of aluminum is heated from 30 degrees C to 150 degrees C. What amount of heat energy is absorbed? 3. Determine the temperature change in each of the following. (a...
October 23, 2011 by Debra

Chemistry
A) if you added 8g of ammonium nitrate to 25mL of room temperature water, what would be the temperature in °C?
November 30, 2014 by J

Chemistry
A 500 mL bottle at room temperature (25˚C) of water is poured over 120 g of ice that is (-8˚C). What will be the final temperature of the water be when all the ice has melted? You can ignore loss of heat to the room.
November 3, 2012 by Paige

Physics
60) A class of 10 students taking an exam has a power output per student of about 200W. Assume the initial temperature of the room is 20 C and that its dimensions are 6.0 m by 15.0 m by 3.0 m. What is the temperature of the room at the end of 1.0 h if all the energy remains in...
November 30, 2010 by Y0gi

physics
A 40-g block of ice is cooled to −71°C and is then added to 590 g of water in an 80-g copper calorimeter at a temperature of 27°C. Determine the final temperature of the system consisting of the ice, water, and calorimeter. (If not all the ice melts, determine how much ...
April 6, 2012 by kevin

physics
A 40-g block of ice is cooled to −71°C and is then added to 590 g of water in an 80-g copper calorimeter at a temperature of 27°C. Determine the final temperature of the system consisting of the ice, water, and calorimeter. (If not all the ice melts, determine how much ...
April 11, 2012 by anthony

Science
90 calories of heat is added to 1 gram of fresh water with an initial temperature of 10 degrees Celcius. What is the final temperature of this liquid? (latent heat of fusion = 80cal/g°C, latent heat of vaporization = 540 cal/g°C)
February 26, 2015 by melissa

Physics
The latent heat of fusion of alcohol is 50 kcal/kg and its melting point is -54oC. It has a specific heat of 0.60 in its liquid state. Calculate the energy needed to melt 2.0 kg of solid alcohol at -54o and raise it to a temperature of -4°C.
June 18, 2013 by Isis

chemistry calculations
At 25 deg C, Kc is 5.84x10-3 for the dissociation of dinitrogen tetraoxide to nitrogen dioxide. N2O4(g) ==== 2NO2(g) a) Calculate the equilibrium concentration of both gases when 4.00 grams of N2O4 is placed at 2.00-liter flask at 25 deg C. b) What will be the new equilibrium ...
August 30, 2014 by =)

geometry
Two angles of a quadrilateral measure 210° and 100°. The other two angles are in a ratio of 2:3. What are the measures of those two angles? I know the four angles add to 360 deg. So the two unknowns are 50 deg together. 20 and 30 deg angles would give a ratio of 2:3, but what ...
April 21, 2011 by Leilani

Physics
How long would it take a kettle with a 1kW heating element to heat 1 litre of water? Watts = Joules / second • Mass of 1 litre of water = 1kg • 1 kW = 1 k Joule / second or 1000 joules/ second • 1g of water needs 4.184J to raise the temperature by 1̊ c. • Water ...
December 15, 2010 by Paul