Natural gas containing 75% CH4, 17% C2H6 and 8% C3H8 is burnt with 125% excess air. Find the complete analysis of the products of combustion if: a. combustion is complete; b. ninety percent of the carbon in the hydrocarbons are converted to CO2 and the rest to CO. Molar ratio of H2 to CO is 1:2 in the stack gas.

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