\(\Delta {n_{(g)}}\,\, = \,\,{n_p} - {n_r}\,\, = \,\,(6 + 3) - (1 + 7.5) = \,\,9 - 8.5\,\, = \,\,\frac{1}{2}\)
$\left( i \right)\,2F{e_2}{O_3}\left( s \right) \to 4Fe\left( s \right) + 3{O_2}\left( g \right)$
${\Delta _r}{G^o} = + 1487.0\,kJ\,mo{l^{ - 1}}$
$\left( {ii} \right)\,2CO\left( g \right) + {O_2}(g) \to 2C{O_2}\left( g \right)$
${\Delta _r}{G^o} = - 514.4\,kJ\,mo{l^{ - 1}}$
તો નીચેની પ્રક્રિયા માટે મુક્ત ઊર્જા ફેરફાર $\Delta_rG^o$ .....$kJ\, mol^{-1}$
$\,2F{e_2}{O_3}\left( s \right) + 6CO\left( g \right) \to 4Fe\left( s \right) + 6C{O_2}\left( g \right)$
$3 C _{2} {H _{2}}_{(g)} \rightarrow C _{6} {H _{6}}_{(l)}$, is $.....\,kJ \,mol ^{-1}$