Br$2($g$)+5$ F$2($g$)2$ BrF$5($g$)\backslash$Delta Hrxn $=-62$ kJ$/$mol

a$.1\mathrm{.}00$ mol of Br$2($g$)$ and $3\mathrm{.}00$ mol of F$2($g$)$ are placed in a $2\mathrm{.}00$ L rigid container. At equilibrium the concentration of Br$2($g$)$ is determined to be $0\mathrm{.}300$ mol$/$L$.$ Calculate the equilibrium concentrations of F$2($g$)$ and BrF$5($g$).$

b$.$ Calculate the equilibrium constant, Keq.