A gas $(=1\mathrm{.}3,\backslash$rho $=0\mathrm{.}287$ kJ$/$kgK$)$ at a Mach number of $1\mathrm{.}8,$ pressure of $0\mathrm{.}8$ bar and temperature of

$373$ K passes through a normal shock. Determine the density of the gas after the shock