The values of $\Delta G$ are very important in metallurgy. The $\Delta G$ values for the following reactions at 1000 K are given as follows.
 $S_2\left(s\right)+2O_2\left(g\right)\to 2S{O}_2\left(g\right);\Delta G=-544kJ$     $2Zn\left(s\right)+S_2\left(s\right)\to 2ZnS\left(s\right);\Delta G=-293kJ$
  $2Zn\left(s\right)+O_2\left(g\right)\to 2ZnO\left(s\right);\Delta G=-480kJ$
The $\Delta G$ for the reaction 
$2ZnS+3O_2\left(g\right)\underset{ }{\to }2ZnO\left(s\right)+2S{O}_2\left(g\right)$ will be