Ethyne (c2 h2 (g), mc032-1.jpghf = 226.77 kj/mol) undergoes complete combustion in the presence of oxygen to produce carbon dioxide (co2 (g), mc032-2.jpghf = –393.5 kj/mol ) and water (h2 o(g), mc032-3.jpghf = –241.82 kj/mol) according to the equation below.

mc032-4.jpg

what is the enthalpy of combustion (per mole) of c2 h2 (g)?
–2511.2 kj/mol
–1255.6 kj/mol
–862.1 kj/mol
–431.0 kj/mol