In the combustion of 0.4 g. of `CH_(4)` 0.25 Kcal. Of heat is liberated. The heat of combustion of `CH_(4)` is

In the combustion of 11 g of CO_(2(g)) , 100 kJ of heat is liberated. Heat of combustion of CO_(2(g)) is______ .

If, combustion of 4g of CH_(4) liberates 2.5kcal of heat, the heat of combustion of CH_(4) is :

If, combustion of 4g of CH_(4) liberates 2.5kcal of heat, the heat of combustion of CH_(4) is :