Calculate the mass of the sample in grams

Chemistry
Tutor: None Selected Time limit: 1 Day

A sample of ethanol (C2H5OH) was burned completely in a bomb calorimeter whose total heat capacity is 30.75 kJ/oC. The temperature of the calorimeter plus the contents increased from 25.6oC to 32.7oC.


Knowing that ethanol's heat of combustion is -3330 kJ/mol, calculate the mass of the sample (in g).
Jun 4th, 2015

Thank you for the opportunity to help you with your question!

Q=mc(t2-t1)

m=Q/c(t2-t1)=-3330/(30.75*(32.7-25.6)) = 15.3g

Please let me know if you need any clarification. I'm always happy to answer your questions.
Jun 4th, 2015

it says i got it wrong

Jun 4th, 2015

please try 15300g

Jun 4th, 2015

no decimals?


Jun 4th, 2015

yes, no decimals

Jun 4th, 2015

wrong =(


Jun 4th, 2015

it says incorrect by more than 10%

Jun 4th, 2015

Sorry for incorrect answer. I can make a refund to you

Jun 4th, 2015

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