2Zn + O2 $ \to $ 2ZnO; $\Delta $Go = $-$ 616 J 2Zn + S2 $ \to $ 2ZnS; $\Delta $Go = $-$ 293 J S2 + 2O2 $ \to $ 2SO2; $\Delta $Go = $-$408 J $\Delta $Go for the following reaction 2ZnS + 3O2 $ \to $ 2ZnO + 2SO2 is

Question

2Zn + O₂ $ \to $ 2ZnO;  $\Delta $G^o = $-$ 616 J
2Zn + S₂ $ \to $ 2ZnS;  $\Delta $G^o = $-$ 293 J
S₂ + 2O₂ $ \to $ 2SO₂;   $\Delta $G^o = $-$408 J
$\Delta $G^o for the following reaction
2ZnS + 3O₂ $ \to $ 2ZnO + 2SO₂ is

$-$ 731 J