The analysis of an industrial fuel gas being burnt with $15\%$ excess atmospheric

air in the furnace of a Hydrofiner is given below.

If $2\mathrm{.}0$mol$\%$ of the combustible carbon $($carbon from Methane and Ethane only$)$ in the

fuel appears as carbon monoxide in the flue gas with all the other carbon appearing

as carbon dioxide, evaluate the flue gas composition

a$)$ On a total basis

b$)$ On a dry basis