option c: 1605.1 kj
the balanced chemical reaction for combustion of methane is as follows:
here, enthalpy formation of is -74.7 kj/mol, 0 kj/mol, -393.5 kj/mol and -241.82 kj/mol respectively.
the heat released or can be calculated as follow:
putting the values,
thus, heat released by combustion of 1 mol of methane is 802.54 kj/mol. thus, for 2 mol, heat released will be:
therefore, heat released by the combustion of 2 mol of methane is 1605.1 kj.