0.16g of methane was subjected to combustion at `27^(@)C` in a bomb calorimeter system. The temperature of the calorimeter system ( including water ) was found to rise by `0.5^(@)C`. Calculate the heat of combustion of methane at (i) constant volume, and (ii) constant pressure . The thermal capacity of the calorimeter system is `17.7 k J K^(-1) ( R = 8.314 kJ K^(-1) mol^(-1))`