$2 A ( g ) \rightarrow A _{2}( g )$
$298\, K$ પર $\Delta U^ \ominus,=-20\, kJ\, mol ^{-1}, \Delta S \odot=-30\, J$$K ^{-1}\, mol ^{-1},$ પછી $\Delta G ^{\ominus}$ ........$J$ હશે?
$=\left(\Delta U^{\circ}+\Delta n_{g} R T\right)-T \Delta S^{\circ}$
$\left.=\left[\{-20+(-1)) \frac{8.314}{1000} \times 298\right\}-\frac{298}{1000} \times(-30)\right] k J$
$=-13.537572 kJ$
$=-13537.57$ Joule
$2C_8H_{18}$ $_{(g)}$ + $25O_2$ $_{(g)}$ $\rightarrow$ $16CO_2$$_{(g)}$ + $18H_2O$ $_{(g)}$