The enthalpies of formation of the compounds in the combustion of methane, mc019-1.jpg, are ch4 (g): mc019-2.jpghf = –74.6 kj/mol; co2 (g): mc019-3.jpghf = –393.5 kj/mol; and h2 o(g): mc019-4.jpghf = –241.82 kj/mol. how much heat is released by the combustion of 2 mol of methane? use mc019-5.jpg. mc019-6.jpg80.3 kj mc019-7.jpg802.5 kj mc019-8.jpg1,605.1 kj mc019-9.jpg6,420.3 kj

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.