Question

calculate the heat of formation of methane Ch4(g)
is its heat of combustion is-780kjmol-1.
the heat of formation ofCo2(g)and H2O(l) are
-388kjmol-1 and -360kjmol-1respectively.
Ms. Sue
Is exam really the name of your school subject?
CH4 + 2O2 ==> CO2 + 2H2O
dHfrxn = (n*dHf products) - (n*dHf reactants)
dHf rxn = -780 kJ/mol
Substitute the others and solve for dHf CO2

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