Solution

1 mole methane = 16 g

16 g of methane when burned produces 890 kJ (from the heat of combustion value given)

1 g produces kJ 1000 g produces kJ = 55,625 kJ 1 kg produces 55,625 kJ Kilogram calorific value = 55,625 kJ Kilogram calorific values are used to compare the efficiencies of fuels.