Homework Help: Chem

Posted by Kelsie on Sunday, October 12, 2008 at 7:00pm.

high purtity benzoic acid (C6H5COOH; ^Hrxn for combustion is -3227kJ/mol) is used as a standard for calibrating bomb calorimeters. A 1.221g sample burns in a calorimeter(heat capacity=1365J/C) that contains exactly 1.270kg of H2O. What temperature change was observed?

Chem - DrBob222, Sunday, October 12, 2008 at 7:49pm
Calculate mols benzoic acid used.
Convert delta H/mol to delta H/mols benzoic acid used. I'll call that q.
1365 J/C x Y degrees = q.
Solve for Y. Don't forget to keep the units straight. The calorimeter constant is given in J/C while the benzoic acid delta H is in kJ/mol.

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