Search: Calculate the amount of heat (in kJ) required to convert 87.5 g of water to steam at 100°C.

Number of results: 38,717

Chemistry please help
Energy/photon = hc/wavelength. Remember to change wavelength meters and use c in m/s. heat required = mass x density x specific heat x delta T. Everything is here to calculate heat required. Knowing heat/photon and the total energy required you can calculate the number of ...
Monday, November 3, 2008 at 9:51pm by DrBob222

Chemistry
How many grams of ice at 0 oC and 1 atm could be melted by the addition of 2.2 kJ of heat? The ∆Hfus of ice is 6.0 kJ/mol.
Thursday, March 10, 2011 at 10:19pm by Anonymous

Chemistry
Based on the results of problems 8 and 9 if the heat of formation of water is -286 kJ/mol, The H ffor CaO(s) is kJ/mol.
Friday, February 11, 2011 at 1:12am by Shawn

physics
A fluid in an insulated, flexible bottle is heated by a high resistance wire and expands. If 9 kJ of heat is applied to the system and it does 5 kJ of work, how much does the internal energy change?
Tuesday, April 6, 2010 at 1:58pm by nish

chemistry
In a coffee-cup calorimeter, 1.91 g of NH4NO3 is mixed with 75.0 g of water at an initial temperature of 25.00oC. After the solution of the salt, the final temperature was 20.94oC. Assuming the solution has a heat capacity of 4.18 J/(goC) and assuming no heat loss to the ...
Tuesday, October 9, 2012 at 5:36pm by Shawn

chem
3.98mL of 2.902M HCL are reacted with 15mL of 3.198 M NaOH. Use molar heat of neutralization to determine the kJ of heat produced. molar heat of neutralization is -55.84kJ/mol.
Thursday, December 2, 2010 at 4:13pm by Anonymous

science
You wish to heat 30 kg of water from 60°C to 80°C. How many kcal of heat are necessary to do this? To how many kJ does this correspond?
Friday, October 12, 2012 at 5:09pm by LeAnne

Chemistry
How much heat on joules is required to melt 3mol of ice? (the heat of fusion is 6.01 kj/mol)
Sunday, April 4, 2010 at 9:08pm by Cassy

College Chem
The heat of combustion of ethanol is -29.8 kJ/g. What is the heat of cmbustion expressed in Joules per kilogram?
Wednesday, January 27, 2010 at 9:20pm by Carleeta

univ. physics
A heat pump has a coefficient of performance of 4.5. If the heat pump absorbs 46.1 cal of heat from the cold outdoors in each cycle, what is the amount of heat expelled to the warm indoors? (in cal)
Thursday, December 13, 2012 at 5:21pm by kate

Science
Write the formula, substitute numbers and units(labels)Mike mixed 20g of 60C water with 40g of 25C water. The final temperature was 39C. 1.Calculate the change of temperature for hot water. 2.Calculate the calories transferred from the hot water. 3.Calculate the amount of heat...
Monday, March 29, 2010 at 6:13pm by Jamie

chemistry
calculate the lattice energy of sodium oxide (Na2O) from the following data: Ionization energy of Na(g): 495 kJ/mol Electron affinity of O2 for 2e: 603 kJ/mol Energy to vaporize Na(s): 109 kJ/mol O2(g) bond energy: 499 kJ/mol Energy change for the reaction 2Na(s)+ 1/2 O2(g)--&...
Friday, September 14, 2012 at 7:46pm by Meeeee

Chemistry
Consider the combustion of propane: C3H8 + 5CO2 -> 3CO2 + 2H20. Delta H = -2221 kJ. What mass of propane must be burned to furnish this amount of energy assuming the heat transfer process is 60.% efficient?
Monday, October 11, 2010 at 1:19am by Anonymous

chemistry
substance X has a molar mass of 107.6 g/mol. When 2.50 g of substance x burns in an iron calorimeter, the temp. of the calorimeter and the water (2.000 Kg) increases from 25.8 deg. C to 38.7 deg. C. What is the molar heat of combustion of substance X in KJ/Mole. Heat capacity ...
Sunday, March 27, 2011 at 10:42am by carla

chemistry
calculate the amount of heat necessary ti raise the temperature of 8.5kg of water from 12.5 to 84 degrees C
Tuesday, May 4, 2010 at 8:18pm by Quentin

college chemistry
Calculate the amount of heat required to evaporate 27.5g of water at 100.0 degrees Celsius
Saturday, May 1, 2010 at 2:35am by Anonymous

Lauren
The amount of heat required to raise temperature of 55.85 g of iron 1 degrees C is called its A. Change of energy B. Enthalpy C. Molar heat capacity D. Specific heat capacity E. Specific Heat.
Friday, November 16, 2007 at 4:42pm by Chemistry

chem
vapor enthalpy energies kj/mol 40.66, specific heat capacities j/g degrees c s(s) 2.1, fus 6.01 enthalpy energies kj/mol 6.01 specifi heat j/g degrees c s(1) 4.2, s(g) 2.0 how much energy is needed to convert 64.0 grams of ice at 0.00 degress c to water at 80 degrees c
Saturday, February 12, 2011 at 1:56pm by paula

chemistry
N2(g) + 3 F2(g) → 2 NF3(g) ΔH° = –264 kJ/mol ΔS° = –278 J/(mol∙K) a. Using the information provided above (only), calculate the maximum amount of non-PΔV work that can be accomplished through this reaction at a ...
Saturday, April 21, 2012 at 6:38am by chamy

CHEM
I wonder if heat of fusion is supposed to be heat of reaction? If so, then use PV = nRT to convert 10 L NH3 at the conditions listed to n = number of moles of NH3. Convert moles NH3 to grams NH3. g = moles x molar mass. Then 92.6 kJ x ??grams NH3/34 = ?? kJ.
Thursday, November 18, 2010 at 7:34pm by DrBob222

chemistry
You received different answers because you didn't make it clear which way the reaction is going to obtain delta H of +92.4 kJ and/or some of the responders didn't note that it is delta Ho. delta Ho is the heat of FORMATION which means 1/2 N2 + 3/2 H2 ==> NH3 ...
Friday, November 19, 2010 at 9:38pm by DrBob222

Chemistry
heat removed from water in going from 21.0 to zero C is mass x specific heat x delta T. mass = 33.6 g specific heat is 4.184 J/g*K delta T is 21.0 - 0. heat added to ice to melt it is mass x heat fusion. mass is the unknown. heat fusion is given. Note: you need to work in the ...
Monday, February 4, 2008 at 12:52pm by DrBob222

College Chemistry
Using the values for the heat of fusion, specific heat of water, or heat of vaporization, calculate the amount of heat energy in each of the following: * calories removed to condense 125g of steam at 100 degree C to cool the liquid to 15 degree C * joules needed to melt a 525-...
Thursday, September 16, 2010 at 3:14am by Kell

physical science
You wish to heat 30 kg of water from 60°C to 80°C. How many kcal of heat are necessary to do this? To how many kJ does this correspond?
Saturday, March 2, 2013 at 12:26am by Anonymous

physics
A heat pump has a coefficient of performance of 4.5. If the heat pump absorbs 46.1 cal of heat from the cold outdoors in each cycle, what is the amount of heat expelled to the warm indoors? (in cal) tried everything but got nothing.
Monday, December 17, 2012 at 12:00pm by jimmy

physics practical investigation
design and conduct an investion to find out whether the amount of heat produced will depend on increase on concentration of Hcl when Hcl reacts with an excess zn.hint...you may investigate either the amount of heat produced or the amount of gas produced(make choice from the ...
Monday, March 25, 2013 at 5:08am by Jossie

Physics
I believe the units for latent heat are kJ/kg. so should ur answer be in kJ/(kg*km^2)? I don't understand the rest of the problem though.
Thursday, April 14, 2011 at 10:16pm by Einstein

Thermochemistry
How many grams of water at 0 degrees C can be frozen into ice at 0 degrees C if 55.0 kJ of heat is removed? delta Hsolid= -6.01 kJ/mol
Tuesday, December 14, 2010 at 11:23pm by Hannah

Chemistry
You have 100 mL solution. Use density to calculate mass from mass = volume x density. mols NaCl formed = M x L = 0.2M x 0.050 = 0.1 mol. delta H rxn = 58.3 kJ/mol or 5.83 kJ for this reaction which is q in the following.. q = [mass NaCl soln x specific heat of NaCl soln x dT...
Monday, November 12, 2012 at 10:07pm by DrBob222

Chemistry
In a coffee-cup calorimeter, 1.70 g of NH4NO3 is mixed with 76.0 g of water at an initial temperature of 25.00°C. After dissolution of the salt, the final temperature of the calorimeter contents is 23.71°C. Assuming the solution has a heat capacity of 4.18 J/°C &...
Monday, July 11, 2011 at 1:15pm by Brittney

chem
It ALWAYS helps if you give us an example and let us show you how to do it. Our examples may not fit your needs. A + B ==> C delta H = -235 kJ. This reaction has a - delta H; that means it is EXOTHERMIC. I prefer to rewrite the equation this way. A + B ==> C + ...
Thursday, November 29, 2012 at 8:12pm by DrBob222

AP Chemistry
Consider a 50.4 g sample of H2O(g) at 115°C. What phase or phases are present when 156 kJ of energy is removed from this sample? Specific heat capacities: ice, 2.1 J/g·°C; liquid, 4.2 J/g·°C; steam, 2.0 J/g·°C, ÄHvap = 40.7 kJ/mol, &...
Friday, November 28, 2008 at 11:25pm by Robert

Chemistry DrBob
I don't understand how you get the answer. I really don't understand any of this, how do I set it up with the numbers? once i get how to do this, then i feel i will understand how to set these up from here on out. so if you could, show all your work, thanks (A). A ...
Wednesday, April 27, 2011 at 10:39pm by Ben

Nsuk
(1)calculate the heat energy datas temperatures 100degree celciuse and 4degree celciuse,mass 0.5kg take latent heat of vapourisation 2.02times10raised to the power of minus6.(2)calculate the specific latent heat of fusion mass of calorimeter 0.01kg and mass of ice 0.09kg and 0...
Friday, February 22, 2013 at 6:34am by Saen

chemistry
Calculate the theoretical amount of CaCl2 that would be required to change the temperature of 50 mL of water from from temperature 20 degrees Celsius to 45 degrees Celsius. Remember that the heat lost during the dissociation is equal to the heat gained by the 50.0 mL of water...
Saturday, November 6, 2010 at 6:32pm by Pat

Chemisrty
Calculate the theoretical amount of CaCl2 that would be required to change the temperature of 50 mL of water from from temperature 20 degrees Celsius to 45 degrees Celsius. Remember that the heat lost during the dissociation is equal to the heat gained by the 50.0 mL of water...
Tuesday, February 23, 2010 at 1:33am by sakura_09

chem 101
Biphenyl (C1 2H1 0) burned in a bomb calorimeter in order to determine its heat of combustion. The heat capacity of the calorimeter was 5.86 kJ/°C When 0.514 g of biphenyl was burned, the temperature of the calorimeter increased from 25.8 °C to 29.4 °C. Determine ...
Sunday, April 15, 2012 at 2:44pm by Anonymous

chem
Then moles in 200 = 200/32 = ?? total heat = [moles x 81.1 x (10)] + [moles x 38,900] = ?? I get about 248,194 J or about 248 kJ. That should be the correct answer if 38.9 kJ is the heat of vaporization AT 30 C (and not at it's boiling point). (38.9 sounds high to me but ...
Monday, February 15, 2010 at 4:46pm by DrBob222

chemistry
When 0.373 g of compound X is burned completely in a bomb calorimeter containing 3000 g of water, a temperature rise of 0.341 C is observed. What is ∆Urxn for the combustion of compound X? The hardware component of the calorimeter has a heat capacity of 3.19 kJ/ &...
Wednesday, January 11, 2012 at 4:40pm by bob

Chem
A chemical reaction in a bomb calormeter evolves 4.66Kj of heat. If the heat capcity of the calorimeter is 1.38 Kj/C what is the temperature change?
Thursday, November 18, 2010 at 2:10pm by Katie

Chemistry
Ok, so I'm stuck....Here is my work thus far (please see my previous response for the values of fusion and vaporization, as well as the specific heats) q=m x specific heat x change in temp =20.0 g x (2.o92 J/g x Kelvin) x (0--5)=209.2 J So... 50,000 J - 209.2 J= 49790.8 J ...
Saturday, December 11, 2010 at 8:50pm by Tichele

chemistry
the value of ΔH° for the reaction of 2 C6H6 (l) + 15 O2 (g) = 12 CO2 + 6H20 is -6535 kJ. how many kJ of heat are released in the combustion of 16.0 g of C6H6 (l) ?
Monday, March 5, 2012 at 8:34pm by Agnes

Chemistry
Hydrogen and methanol (CH3OH) have both been proposed as alternatives to hydrocarbon fuels. a) Write balanced chemical equations for the complete combustion of hydrogen and the complete combustion of gaseous methanol. Combustion reaction for hydrogen: 2H2(g)+ O2 --> ...
Thursday, November 4, 2010 at 1:30am by Jarrod

chemsitry
A sample consisting of 0.025 mol of a solid compound is placed inside a metal cylinder. The cylinder was immersed in a water bath consisting of 10.00 kg of water at an original temperature of 25.00 °C. When the compound decomposes, the temperature of the water rises to 29....
Saturday, October 23, 2010 at 2:35pm by Nora

Chemistry
If an amount of heat q is applied to an object and its temperature changes by ÄT, the amount of heat that must be applied to change the temperature by 10ÄT is
Wednesday, May 12, 2010 at 7:20am by write2khin

chemistry
In the following experiment, a coffee-cup calorimeter containing 100 mL of H20 is used. The initial temperature of the calorimeter is 23.0 C . If 3.60 g of CaCl2is added to the calorimeter, what will be the final temperature of the solution in the calorimeter? The heat of the ...
Thursday, October 20, 2011 at 3:01pm by Colin

Chemistry
This is for a titration, to measure the amount of acid that can be neutralised by gaviscon. I know how to work out the first 3 but I'm not sure on the others. I think i need to use the calculation c=n x v but i don't know where and why? Theory. How do you work them out...
Tuesday, December 9, 2008 at 5:19pm by Anonymous

Chemistry
"Given that the bond enthalpy of the carbon-oxygen bonds in carbon monoxide and carbon dioxide are 1073 kJ/mol and 743 kJ/mol respectively, and that of the bond in the oxygen molecule is 496 kJ/mol, calculate the enthalpy change for the combustion of 1 mole of carbon ...
Thursday, April 8, 2010 at 10:54pm by Stuck

chemistry
How would you figure: How much energy, in kJ, is absorbed by 23.8 g of acetone when it evaporates if its molar heat of vaporization is 32.0 kJ/mol? Acetone formula is C3H6O
Tuesday, April 23, 2013 at 12:53pm by Taylor

chemistry
Find the molar heat of vaporization for a substance, if 3.28mol of the substance absorbs 24.8 kJ of energy when it changes from a liquid to a gas. Answer in units of kJ/mol
Thursday, March 1, 2012 at 5:38pm by nelson

CHEM HELP ASAP!!
Two 20.0-g ice cubes at –10.0 °C are placed into 275 g of water at 25.0 °C. Assuming no energy is transferred to or from the surroundings, calculate the final temperature of the water after all the ice melts. heat capacity h2o (S)=37.7 j/mol*k heat capacity h2o (l...
Tuesday, September 11, 2012 at 8:18am by Jordan

chemistry
calculate the amount of heat released when 50g of water at 100degrees hits the skin, condenses, cools the body to 37 degrees
Tuesday, September 21, 2010 at 2:38pm by christian

physics practical investigation
design and conduct an investion to find out whether the amount of heat(gas) produced will depend on an increase on the concentration of Hcl when Hcl reacts with an excess zn.hint...you may investigate either the amount of heat produced or the amount of gas produced(make choice...
Monday, March 25, 2013 at 5:07am by Jossie

chemistry
CH3OH(g) ----> CO(g) + 2H2 (g) (delta H =+90.7k) A) is heat absorbed or released in the course of this reaction? b) calculate the amount of heat transferred when 45.0g of CH3OH(g)is decomposed by this reaction at constant pressure. c) for a given sample of CH3OH, the ...
Monday, October 17, 2011 at 12:32am by Anna

chemistry
Substance x has a molar mass of 107.6 g/mol. when 2.50 g of substance x burns in an iron calorimeter the temp. of calorimeter and water (2.000Kg)increases from 25.8 d Celsius to 38.7 d celsius. What is the molar heat of combustion of substance x in kJ/mol. the heat capacity of...
Sunday, March 27, 2011 at 3:14pm by carla

Chemistry Help Please!
How much heat is in each? q = mass x specific heat x T Calculate to see how much heat is in each. The water has MUCH more heat; therefore, the temperature drops less.
Sunday, January 23, 2011 at 12:31pm by DrBob222

chemistry
When 0.572 g of compound X is burned completely in a bomb calorimeter containing 3000 g of water, a temperature rise of 0.461 ◦ C is observed. What is ∆Urxn for the combustion of compound X? The hardware component of the calorimeter has a heat capacity of 3...
Tuesday, October 2, 2012 at 8:54pm by Austin

chemistry
Data given are related to the Born-Haber cycle for HCl Calculate the amount of energy lost when the ionic species return to their molecular form. Atomization of ½H2(g)=217.6KJ/mol 1st Ionisation of ½H2(g)=1312KJ/mol Atomization of ½Cl2(g)=121 KJ/mol 1st ...
Wednesday, March 28, 2012 at 5:40am by Francesca

Chemistry
A combination limiting reagent problem with a heat reaction problem. 2H2 + O2 ==> 2H2O First let's determine the limiting reagent and the amount of H2O vapor formed. mols H2 = g/molar mass = 4.02/2.01 = 2 mols. mols O2 = 25/16 = 1.56 Now convert mols of each to mols...
Wednesday, October 17, 2012 at 10:55am by DrBob222

CHEMISTRY
q absorbed by water = mass x heat capacity x delta T. Calculate amount of heat generated by oven. q will be in joules. Then Energy = hc/lambda. h is Planck's constant, c is speed of light in meters/sec and you have lambda (I guess 13 cm is lambda but you don't say that...
Wednesday, October 31, 2007 at 3:00pm by DrBob222

Chemistry
Note the correct spelling of celsius. q = mass H2O x specific heat H2O x (Tfinal-Tinitial) q = heat combustion heat combustion/g = q/1.32g\ heat combustion/mol = (q/1.32)*molar mass. This will be in J/mol. Convert to kJ/mol.
Thursday, February 7, 2013 at 1:10pm by DrBob222

Science
Calculate the quantity of energy required to change 3.00 mol of liquid water to steam at 100°C. The molar heat of vaporization of water is 40.6 kj/mol
Monday, March 25, 2013 at 9:32pm by Emily

Chemistry
Ethanol is a fuel that can be made from corn. How many kJ of heat energy are released when 3.00 kg of ethanol are burned? C2H5OH(l) + 3O2(g) ¨ 2CO2(g) + 3H2O(g) H = -1406.8 kJ/mol
Saturday, April 17, 2010 at 11:33am by Marcus

chemistry
The rise is T for H2O is your route to heat involved. q = mass H2O x specific heat H2O x delta T. Then q/1.07 = delta H/gram. Usually these are quoted in kJ/mol. (delta H/gram NH4NO3) x molar mass NH4NO3 x (1 kJ/1000 J) = ? Note: Since T went down you know it was cooled and ...
Friday, November 16, 2012 at 11:02pm by DrBob222

physics
Use the area, thickness, and density to calculate the mass of ice. Then mass ice x specific heat ice x 12.6 = joules necessary to raise the temperature of the ice to zero degrees C. then add in the amount to melt the ice which is mass ice x heat of fusion. Watch the units. ...
Monday, April 14, 2008 at 4:03pm by DrBob222

physics practical investigation
design and conduct an investion to find out whether the amount of heat(gas) produced will depend on an increase on the concentration of Hcl when Hcl reacts with an excess zn..guidance/hint...you may investigate either the amount of heat produced or the amount of gas produced(...
Monday, March 25, 2013 at 5:06am by Jossie

Chemistry
How many grams of butane must be burned to provide the heat needed to melt a 85.0-g piece of ice (at its melting point) and bring the resulting water to a boil (with no vapourization)? Assume a constant pressure of 1 bar and use the following data: Hfo(H2O(g))=-241.83 kJ/mol, ...
Monday, January 23, 2012 at 11:40pm by David

Chemistry
2CO(g) + O2(g) 2CO2(g) Go = -511.6 kJ and So = -173.1 J/K at 314 K and 1 atm. The maximum amount of work that could be done by this reaction when 2.43 moles of CO(g) react at standard conditions at this temperature is__________ kJ. how?!
Thursday, April 26, 2012 at 6:31pm by Bryan

chemistry
13.98mL of 2.902M HCl are reacted with 15mL of 3.198M NaOH. Use the molar heat of neutralization to determine the kJ of heat produced.
Tuesday, November 23, 2010 at 11:59am by serena

Chemistry
Calculate the entropy change in the surroundings when 1.00 mol N2O4(g) is formed from 2.00 mol NO2(g) under standard conditions at 298 K. I get +192 J/K. The book says -192 J/K. Here is my work, where am I going wrong? Standard Enthalpy of NO2(g) = 33.18 kJ/mol * 2 mol = 66.36...
Saturday, February 21, 2009 at 1:58pm by chemstudent

Chemistry
Calculate the enthalpy of reaction. D + F --> G + M using the following equations and data: G + C --> A + B ΔH = +277 kJ C + F --> A ΔH = +303 kJ D  B --> M ΔH = -158 kJ
Monday, March 21, 2011 at 10:17am by Josh

CHEMISTRY> HELP QUICK! pls
Calculate the reaction free energy of: H2(g) + I2(g) 2HI(g) when the concentrations are 0.026 mol L-1 (H2), 0.33 mol L-1 (I2), and 1.84 mol L-1 (HI), and the temperature is 700K. For this reaction Kc= 54 at 700 K. +11.6 kJ mol-1 0 kJ mol-1 -11.6 kJ mol-1 +2273 kJ mol-
Sunday, September 5, 2010 at 7:45am by Lucinda

A2 Chemistry
This question is about the unnecessary production of carbon dioxide Outdoor flames, such as patio heaters and the Olympic flame, contribute to global warming. This is not only due to the heat released, but also due to the carbon dioxide produced from the combustion of ...
Monday, February 11, 2013 at 1:59pm by Chris

Chemistry
The amount of heat liberated will be Q = M*(Hv + 100 Cp) where M = Mass (18.0g), Hv = the heat of vaporization per gm (540 Cal/g), and Cp is the specific heat of liquid water (1.00 Cal/g deg.C) Q = 18*(540 + 100) = 11,520 Calories Divide this by the heat of fusion of ice, 80 ...
Monday, March 3, 2008 at 12:21am by drwls

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
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

chemistry
The enthalpy of combustion of benzoic acid (C6H5COOH) which is often used to calibrate calorimeters, is −3227 kJ/mol. When 1.402 g of benzoic acid was burned in a calorimeter, the temperature increased by 3.401 ◦ C. What is the overall heat capacity of the ...
Tuesday, October 2, 2012 at 9:54pm by Austin

Chem ? Help!
What is the answer and how do I Calculate the quantity of energy required to change 3.00 mol of liquid water to steam at 100°C. The molar heat of vaporization of water is 40.6 kJ/mol.
Monday, May 19, 2008 at 2:02pm by Lisa

Chemistry
These are the numbers I calculated: Cm(ice)=4.57 kJ Delta H(fus)=75.06 kJ Cm(water)=94.17 kJ Delta H(vap)=507.97 kJ Cm(steam)=11.25 kJ Total= 693 kJ
Saturday, April 17, 2010 at 8:46pm by Eddie

Chemistry
55 kJ of heat are added to 200 kg of a metal at 28.00◦C and the temperature rises to 29.18◦C. What was the metal? 1. tungsten (speciﬁc heat = 0.134 J/g · ◦ C) 2. copper (speciﬁc heat = 0.385 J/g · ◦ C...
Wednesday, April 10, 2013 at 10:04am by Arturo

Chemistry
How much energy as heat is removed from the hand when 5.00 grams of Ga initially at 20 degrees C melts? The value of Heat Fusion is 5.576 kJ-mol and the specific heat of Ga is 0.374 J-g-K. Take the final temp to be 29.76 degrees C.
Friday, February 8, 2013 at 12:53am by Student

Chemistry
For the reaction: CH4(g) + 2O2(g)-->CO2(g)+2H2O (l) ÄH = -50.38 kJ/mol, How many moles of methane (CH4) must be burned to produce 137 kJ of heat?
Sunday, November 7, 2010 at 2:37pm by Luke

chemistry
Calculate the amount of heat required to raise the temperature of a 25 sample of water from 7 to 25.
Monday, September 20, 2010 at 11:20pm by Anonymous

Chemistry
The heat capacity of liquid water is 4.18 J/g·°C and the heat of vaporization is 40.7 kJ/mol. How many kilojoules of heat must be provided to convert 1.00 g of liquid water at 67°C into 1.00 g of steam at 100°C?
Sunday, November 13, 2011 at 9:36pm by Sue

chemistry
That 25.7 kJ usually is quoted as 235.7 kJ/mol which means 25.7 kJ/80g. Therefore, heat absorbed by the NH4NO3 will be 25,700 J x (40/80) = about 13,000 J Then -13000J = 125 x 4.184 x (Tf-Ti) Tf = unknown Ti = 25C Tf is something like 0.5C but that's an estimate.
Sunday, July 15, 2012 at 8:13am by DrBob222

Chemistry
Part A Calculate the standard enthalpy change for the reaction 2A+B --->2C +2D Use the following data: Substance Delta H(kJ/mol) A -263 B -391 C +203 D -523 Express your answer in kilojoules. MY ANSWER FOR PART A: Delta H =277 kJ PART B----THIS ONE I NEED HELP ON ...
Thursday, June 16, 2011 at 1:00pm by tina

Chemistry
The enthalpy of combustion of benzoic acid(C6H5COOH) which is often used to calibratecalorimeters, is −3227 kJ/mol. When 1.316 gof benzoic acid was burned in a calorimeter, the temperature increased by 2.226◦C. What is the overall heat capacity of the ...
Friday, August 3, 2012 at 5:23pm by Yannan Huang

Chemistry (Thermo)
Thank you, I still can't seem to get the last one. We are given our data in kJ/mol So would q = n (heat fusion ice + heat sublimation ice + (heat capacity water x delta T)) ? We also don't have the heat vaporisation value. Only for sublimation - is it the same? They ...
Friday, September 10, 2010 at 10:25am by Amy

chemistry check
please check Write the balanced equation, with the enthalpy component, for the rusting process, given that Hf for iron and oxygen is 0 and Hf for ferric oxide is -826 kJ/mol. 4 Fe (s) + 3 O2 (g) --------> 2 Fe2O3 (s) You need to add the heat one of three ways. 4 Fe (s...
Thursday, February 8, 2007 at 9:35am by key

Chemistry
Calculate the average translational kinetic energy (kJ/molecule) for a molecule of NH3 at 431 K, assuming it is behaving as an ideal gas. I understand how to figure out the kJ/mole, but I don't understand how to get the kJ/molecule that this question is asking for. Can ...
Sunday, April 11, 2010 at 11:37pm by Luc

physics
A heat engine takes in 840 kJ per cycle from a heat reservoir. which is not a possible value of the engine's heat output per cycle?
Tuesday, May 8, 2012 at 9:32am by ramiro

Chemistry
For a particular reaction at 195.1 °C, ΔG = -1488.09 kJ/mol, and ΔS = 288.67 J/(mol·K).? Calculate ΔG for this reaction at -20.0 °C. delta G = delta H - (T*delta S) -1488.09 kJ/mol = (delta H) - ((461.8K)*(+288.67 J/(mol x K))*(1 kJ/...
Tuesday, April 30, 2013 at 4:01pm by Dee

Chem
The actual heat of formation of MgO is -601.8 kJ/mol. Convert this to kcal/mol and calculate your % error. And list two possible sources of procedural error to account for this percentage.
Sunday, March 18, 2012 at 10:45pm by Danny

Chemistry HEAT OF FUSION
What amount of energy is required to melt a 26.9 g piece of ice at 0oC? The heat of fusion of ice = 333 Jg-1 Heat required to melt the ice = J What amount of energy must be removed from 120 g of water to cool it from 72.1oC to 12.4oC? Specific heat of water = 4.184 JK-1g-1 ...
Thursday, October 6, 2011 at 8:34pm by tanner

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Search: Calculate the amount of heat (in kJ) required to convert 87.5 g of water to steam at 100&deg;C.

Search: Calculate the amount of heat (in kJ) required to convert 87.5 g of water to steam at 100°C.