Anlsysis of a given fuel has a equivalent molar composition of $C_{6\mathrm{.}2}{H}_{14\mathrm{.}3}{O}_{5\mathrm{.}1}$

Determine the mass of air required for stoichiometric combustion with $1kg$ of the fuel

The mass of air, to $1$ decimal place, required for stoiciometric combustion is:

A gas analyser connected to a combustion system combusting the fuel above has the following gas concentrations:

Percentatge of Carbon Dioxide: $16\mathrm{.}4\%$

Percentage of Oxygen: $2\mathrm{.}5\%$

Calcualte the air$-$to$-$fuel equivalence ratio $().$

The air$-$to$-$fuel equivalence raito, to $2$ decimal places, is: