Gibb's free energy and equilibrium constant.

The following concentrations were obtained for the formation of $\mathrm{NH}{\phantom{A}}_3$‍ from $\mathrm{N}{\phantom{A}}_2$‍ and $\mathrm{H}{\phantom{A}}_2$‍ at equilibrium at $500\mathrm{K}$‍:

$[\mathrm{N}{\phantom{A}}_2]=1.5\times {10}^{-2}\mathrm{M}$‍, $[\mathrm{H}{\phantom{A}}_2]=3\times {10}^{-2}\mathrm{M}$‍ and $[\mathrm{NH}{\phantom{A}}_3]=1.2\times {10}^{-2}\mathrm{M}$‍

$-$‍ $\mathrm{KJ}/\mathrm{mol}$‍.