Analysis of a given fuel has a equivalent molar composition of C$8\mathrm{.}9$H$19\mathrm{.}4$O$6\mathrm{.}3$

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

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

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

Percentage of Carbon Dioxide: $14\mathrm{.}7\%$

Percentage of Oxygen: $4\mathrm{.}0\%$

Calculate the air$-$to$-$fuel equivalence ratio $($x$).$

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