Problem: What mass of natural gas (CH4) must you burn to emit 268 kJ of heat?CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(g)             Hrxno= –802.3 kJ/mol

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We are asked what mass of natural gas (CH4) must you burn to emit 268 kJ of heat.


We'll use the thermochemical equation to calculate the mass of CH4.

Molar mass CH4 = 16.05 g/mol


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Problem Details

What mass of natural gas (CH4) must you burn to emit 268 kJ of heat?

CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(g)             Hrxno= –802.3 kJ/mol