A 0.500-g sample of n-heptane(ℓ) burned in a constant volume calorimeter  to CO2(g) and H2O(ℓ) causes a temperature rise of 2.934 °C. If the heat  capacity of the calorimeter and its accessories is 1954 cal/°C, and the mean  temperature of the calorimeter is 25 °C, calculate:   (a) The heat of combustion per mole of the heptane at constant volume;   (b) The heat of combustion of the heptane per mole at constant pressure.

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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A 0.500-g sample of n-heptane(ℓ) burned in a constant volume calorimeter 
to CO2(g) and H2O(ℓ) causes a temperature rise of 2.934 °C. If the heat 
capacity of the calorimeter and its accessories is 1954 cal/°C, and the mean 
temperature of the calorimeter is 25 °C, calculate: 
 (a) The heat of combustion per mole of the heptane at constant volume; 
 (b) The heat of combustion of the heptane per mole at constant pressure. 


Thermochemistry( answers must be  a) ∆U = –1149 kcal; ∆H = –1151 kcal )

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