QUESTION $4($CO$2)$

A gas contains $80\mathrm{.}0wt\%$ propane, $15wt\%$ n$-$butane and the balance water.

a$)$ Calculate the molar composition of this gas on both a wet and dry basis and the ratio $($mol $H_2\frac{O}{?}$ mol dry gas$)$

$(5$ marks$)$

b$)$ If $100k\frac{g}{h}$ of this fuel is to be burned with $30\%$ excess air, what is the required air feed rate $).$

$(5$ marks$)$