Week 8 Recitation Quiz Key

Week 8 Recitation Quiz Key - A 1.640 g sample of benzoic...

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Week 8 Recitation Quiz Name: _____________________________________ Lab: ___________________ Instructions: Answer the problem and be sure to show your work . One (1) point is awarded for your name. The remaining four (4) points are awarded for partial credit and full correctness. Equations of note: q  = nC  q  = cm  q  = C T -q sys  =   q surr H combustion = q The heat of combustion of benzoic acid (HC 7 H 5 O 2 ) is –26.38 kJ/g.
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Unformatted text preview: A 1.640 g sample of benzoic acid is combusted in a bomb calorimeter. The temperature of the calorimeter increases from 22.25º C to 27.20 ºC. What is the heat capacity of the calorimeter?-q sys = q surr-q benzoic acid = q Cal-q benzoic acid = C Cal ∆ T Note q must be in kJ or J. It cannot be in kJ/g.-(-26.38 kJ/g)(1.640 g) = C Cal (27.20 – 22.25) 8.74 kJ/ o C = C Cal...
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This note was uploaded on 04/12/2008 for the course CHEM 109 taught by Professor Malina during the Spring '08 term at UNL.

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