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Equation: CH4(g) + 2 O2(g) -> CO2(g) + 2 H2O(L), ΔH(rxn) = -889.1 KJ/mol(rxn)

Substance: ΔHf ° (KJ/mole):
H2O(L). -285.8
H2O(g). -241.8
CO2(g). -393.3
Which of the following is the standard heat of formation of methane (ΔHf°CH4(g)), as calculated from the data above?
A) - 75.8 KJ/mole(rxn)
B) 75.8 KJ/mole(rxn)
C) 210.0 KJ/mole(rxn)

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