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IIT JEE Advanced 2009 Paper 2

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Question : 31

Total: 57

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 298.0 K to 298.45 K due to the combustion process. Given that the heat capacity of the calorimeter is 2.5 kJK−1, the numerical value for the enthalpy of combustion of the gas in kJmol−1 is ______.

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