In a constant volume calorimeter, 3.5 g of a gas with molecular weight 28 was burnt in excess oxygen at 298.0 K. The temperature of the calorimeter was found to increase from 298 K to 298 K due to the combustion process. Given that the heat capacity of the calorimeter is 2.5 kJ K - 1 , the value for the enthalpy of combustion of the gas is

Question

In a constant volume calorimeter, 3.5 g of a gas with molecular weight 28 was burnt in excess oxygen at 298.0 K. The temperature of the calorimeter was found to increase from 298 K to 298 K due to the combustion process. Given that the heat capacity of the calorimeter is 2.5 kJ K - 1 , the value for the enthalpy of combustion of the gas is, 90 kJ m o l - 1, 9 kJ m o l - 1, 18 kJ m o l - 1, 6 kJ m o l - 1

MARKS App · Accepted Answer

Energy released by combustion of 3.5 g gas = 2.5 × ( 298.45 - 298 ) k J Energy released by 1 mole of gas = 2.5 × 0.45 3.5 / 28 = 9 k J m o l - 1

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