The enthalpies of formation of the compounds in the combustion of methane,
ch4 (9)+20,(g) → c02(g) +2h2o(g),
are ch4(g): ah = -74.6 kj/mol; co2(g): ah+ = -393.5 kj/mol; and h2o(g): ahp= -241.82 kj/mol.
how much heat is released by the combustion of 2 mol of methane?
use ah xn=(ahi products) - (ahereactants).
-80.3 kj
-802.5 kj
o-1,605.1 kj
o -6,420.3 kj