At 298 K in a constant volume calorimeter 0.01 mole of TNT was detonated when 8180 cals of heat ...

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 kJ K^(-1) , find the numerical value for the enthalpy of combustion of the gas in kJ mol^(-1)

Molar specific heat of oxygen at constant pressure is 7.2 cal/mol .^(@)C and R=8.3 J/mol K. at constant volume, 5 moles of oxygen is heated from 10^(@)C to 20^(@)C then the quantity of heat required will be