Question: What is the heat of reaction for CH4 + 2O2 -> CO2 + 2H2O, if heat of formation of CH4, O2, CO2 and H2O are 10 J, 5 J, 6 J, and 12 J respectively?
Options
A : -10 J
B : 10 J
C : -20 J
D : 20 J
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