Under constant-volume conditions the heat of combustion of benzoic acid (C6H5COOH) is 26.38 kJ/g. A 2.740?g sam...
Under constant-volume conditions the heat of combustion of benzoic acid (C6H5COOH) is 26.38 kJ/g. A 2.740?g sample of benzoic acid is burned in a bomb calorimeter. The temperature of the calorimeter increases from 21.40?C to 29.97?C.
What is the total heat capacity of the calorimeter?
A 1.460?g sample of a new organic substance is combusted in the same calorimeter. The temperature of the calorimeter increases from 22.14 ?C to 27.09 ?C. What is the heat of combustion per gram of the new substance?
Homework Answers
(1) Heat released = mass of benzoic acid x heat of
combustion
= 2.740 x 26.38 = 72.2812 kJ
Heat capacity of calorimeter = heat released/temperature change of
calorimeter
= 72.2812/(29.97 - 21.40)
= 8.4342 kJ/C = 8.434 kJ/C
(2) Heat released = heat capacity x temperature change of
calorimeter
= 8.4342 x (27.09 - 22.14) = 41.7493 kJ
Heat of combustion = heat released/mass of substance
= 41.7493/1.460
= 28.60 kJ/g
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Under constant-volume conditions the heat of combustion of benzoic acid (C6H5COOH) is 26.38 kJ/g. A 2.740?g sam...
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