66. A gaseous fuel mixture has a molal analysis:

H2 = 14% CH4 = 3% CO = 27% O2 = 0.6% CO2 = 4.5% N2 = 50.9%

Determine the air-fuel ratio for complete combustion on molal basis.

A. 2.130

B. 3.230

C. 1.233

D. 1.130