The volumetric composition of combustion gases exiting a high$-$performance engine are below.

Determine the mass fraction, Xi and mole fractions, Yi for each species. Assuming the exhaust

pressure is $1\mathrm{.}3$ atm, calculate the partial pressure for each species, and the molecular weight

$($kg$/$kmol$),$ and gas constant $($J $/$kg K$)$ for the mixture.

iso$-$octane: $0\mathrm{.}1\%$ acetylene: $0\mathrm{.}6\%$ O$2$: $3\mathrm{.}5\%$ N$2$: $77\%$

H$2$O: $3\mathrm{.}7\%$ CO$2$: $4\mathrm{.}4\%$ CO: $10\mathrm{.}7\%$