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December 20, 2014

Homework Help: Chemistry

Posted by Anne on Wednesday, December 12, 2007 at 8:26pm.

drwls, if you are there, I got an answer of 42.5 Kelvin, so then that means it is a negative number if converted to degrees Celsius?

Question:

The heat capacity of a bomb calorimeter is 87.5 kJ/K (this value is for the total heat capacity including that of the water jacket around the reaction chamber). If 67.2g of CH4 (g), is combusted under such reaction conditions, what will be the increase in temperature of the calorimeter? Delta Ecombustion for CH4 (g) is -885.4 kJ/mol.


Answer:

drwls, Wednesday, December 12, 2007 at 7:38am

Calculate the heat energy release:
The number of moles of CH4 you are burning is 67.2/16 = 4.20 mol
Multiply that by 885.4 kJ/mol for the heat release. Then divide that by 87.5 kJ/K for the temperature rise.

Or, you could do it all at once

Delta T = (67.2g*885.4kJ/mol)/(16 g/mol*87.5 kJ/K) = ? K

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