Calculate the heat released per gram for each of these fuels:

Hello, could someone please show me how to answer this question:

Calculate the heat released per gram for each of these fuels:

Methane, CH4 Heat of combustion = 890 kJ mol-1

Butane, C4H10 Heat of combustion = 2877 kJ mol-1

Hydrogen, H2   Heat of combustion = 286 kJ mol-1

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