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A gaseous fuel with 80 percent CH4, 15 percent N2, and 5 percent O2 (on a mole basis) is burned to completion with 120 percent theoretical air that enters the combustion chamber at 30°C, 100 kPa, and 60 percent relative humidity. Determine

(a) The air-fuel ratio and

(b) The volume flow rate of air required to burn fuel at a rate of 2 kg/min.

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