Consider the following data for the reaction X_2( g )+ Y_2( g ) ⇌ 2 XY ( g ) at 600 K. The Δ_r G^ (in kJ mol^-1 ) for the reaction is:

Consider the following data for the reaction $$\mathrm{X}_2(\mathrm{~g})+\mathrm{Y}_2(\mathrm{~g}) \rightleftharpoons 2 \mathrm{XY}(\mathrm{~g}) $$ at $\displaystyle 600$ K . The $\displaystyle \Delta_{\mathrm{r}} \mathrm{G}^{\ominus}$ (in $\displaystyle \mathrm{kJ} \mathrm{mol}^{-1}$ ) for the reaction is :

Compound	$\displaystyle \Delta_f \mathrm{H}_{600 \mathrm{~K}}^{\ominus}\left(\mathrm{kJ} \mathrm{mol}^{-1}\right)$	$\displaystyle \mathrm{S}^{\ominus}{ }_{600 \mathrm{~K}}\left(\mathrm{J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\right)$
XY(g)	$\displaystyle 42$	$\displaystyle 200$
$\displaystyle \mathrm{X}_2(\mathrm{~g})$	$\displaystyle 8$	$\displaystyle 140$
$\displaystyle \mathrm{Y}_2(\mathrm{~g})$	$\displaystyle 80$	$\displaystyle 250$