6. The combustion of methane gas is represented by the reaction: CH4 (g) + 2 O2 → CO2(g) + 2 H2O

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6. The combustion of methane gas is represented by the
reaction:
CH4 (g)
+ 2 O2
→ CO2(g)
+ 2 H2O (g)
Calculate the ∆ H°rx given the following
information.
Substance
∆Hf°
CH4
- 74.8 kJ/mole
O2
0
kJ/mole
CO2
-393.5 kJ/mole
H2O
-241.8 kJ/mole
b. Is the above reaction
endothermic or exothermic ? ___________________