One mole of methane undergoes complete combustion in a stoichiometric amount of air. The reaction proceeds as CH4 + 2O2 ? CO2 + 2H2O. Both the reactants and products are in gas phase. ?H298 = 730 kJ/mole of methane. Mole fraction of water vapour in the product gases is about_____________________?
A. 0.33
B. 0.19
C. 0.4
D. 0.67
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