A)What is the total heat capacity of the calorimeter? B)A 1.450 ?g sample of a new organic substance is combusted in...
A)What is the total heat capacity of the calorimeter?
B)A 1.450 ?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
Given that
Mass of benzoic acid = 2.780 g
Heat of combustion of benzoic acid= 26.38 KJ/g
Therefore
(1) Heat released = mass of benzoic acid x heat of
combustion
= 2.780 x 26.38
= 73.3364 kJ
Heat capacity of calorimeter = heat released/temperature change of
calorimeter
= 73.3364 /(29.98 - 21.40)
= 73.3364 /(8.58)
= 8.547 kJ/C
(2) Heat released = heat capacity x temperature change of
calorimeter
= 8.547 x (27.09 - 22.14) = 41.7493 kJ
Heat of combustion = heat released/mass of substance
= 41.7493/1.450
= 28.8 kJ/g
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