A sample of n-octane ( 1.14 g ) was completely burnt in excess of oxygen in a bomb calorimeter, whose heat capacity is 5 kJ K − 1 . As a result of combustion reaction, the temperature of the calorimet

Question

A sample of n-octane ( 1.14 g ) was completely burnt in excess of oxygen in a bomb calorimeter, whose heat capacity is 5 kJ K − 1 . As a result of combustion reaction, the temperature of the calorimeter is increased by 5 K. The magnitude of the heat of combustion of octane at constant volume is ______ kJ mol − 1 (nearest integer).

TestHub · Accepted Answer

Mole of octane = 114 1.14 ​ = 0.01 mole Heat evolved = C × Δ T ​ = 5 × 5 kJ = 25 kJ ​ ∴ Magnitude of Heat of combustion = 0.01 25 ​ = 2500 kJ / mole

Chemistry - Thermochemistry Question with Solution | TestHub

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