Homework Help: Calorimetry

Posted by Sarah on Tuesday, September 23, 2008 at 1:53am.

A calorimeter contains 21.0 mL of water at 12.0 degress Celsius. When 2.40g of X (a substance with a molar mass of 50.0 g/mol ) is added, it dissolves via the reaction
X(s)+H2O(l) --> X (aq)

and the temperature of the solution increases to 29.5 degress celsius.
Calculate the enthalpy change, H , for this reaction per mole of X .

Assume that the specific heat and density of the resulting solution are equal to those of water [4.18 J/(g* degress celsius and 1.00 g/mL ] and that no heat is lost to the calorimeter itself, nor to the surroundings.

Express your answer numerically in kilojoules per mole.

Chemistry - Writeacher, Tuesday, September 23, 2008 at 9:22am
Please note that we don't do students' homework for them. Our tutors try to give you the information to help you complete your assignment on your own. If there's not a tutor with this specialty online right now, be sure to go back into your textbook or use a good search engine. http://hanlib.sou.edu/searchtools/

Once YOU have come up with attempted answers to YOUR questions, please re-post and let us know what you think. Then someone here will be happy to comment on your thinking.

=)
Calorimetry - Anonymous, Wednesday, October 13, 2010 at 12:30am
idk
Calorimetry - Anonymous, Monday, March 18, 2013 at 3:11pm
thats not really helpful to students who need chistry help..at least the tudors will give you a generic format to get you started. saying you dont do homework doesnt benfit anyone..you have wasted our time
Calorimetry - Anonymous, Friday, April 5, 2013 at 8:35pm
wow

Answer this Question

Related Questions

chemistry - Substance x has a molar mass of 107.6 g/mol. when 2.50 g of ...
chem - A calorimeter contains 16.0ml of water at 15.0degrees celsius. When 1.60g...
chemistry - substance X has a molar mass of 107.6 g/mol. When 2.50 g of ...
Chemistry - A calorimeter contains 22.0 mL of water at 14.0 C. When 2.50 g of X...
Chemistry - A calorimeter contains 21.0 mL of water at 14.0 degreesC. When 1.90 ...
Chemistry - In lab we did thermochemistry, where we are supposed to find the ...
Chemistry - A calorimeter contains 30.0 mL of water at 11.0 degrees C. When 1.50...
Chemistry - A coffee-cup calorimeter initially contains 125 g water at 24.2 ...
Chemistry - The molar enthalpy of combustion of glucose is -2803 kJ. A mass of 1...
Chemistry - The molar enthalpy of combustion of glucose is -2803 kJ. A mass of 1...

For Further Reading

First Name:
School Subject:
Answer: