A gas stream at $1$ atm pressure contains a mixture of CO$,$ CO$2$ and N$2.$ The mole fraction ratios of CO and CO$2$ in the mixture are $0\mathrm{.}10$ and $0\mathrm{.}20,$ respectively. The gas flow temperature is $1200$ K$.$ Calculate a$]$ the absolute entapy of the mixture in both mol kj kmol and mass kj kg and b$]$ the mass fraction ratios of the gases in the mixture.