${S_R} + {O_{2\left( g \right)}} \to S{O_{2\left( g \right)}};\,\Delta H = - 296.90\,kJ$
${S_M} + {O_{2\left( g \right)}} \to S{O_{2\left( g \right)}};\,\Delta H = - 299.40\,kJ$
$ii)$ $S _{ M }+ O _2 \longrightarrow SO _2 \quad \Delta _{ ii }=-299.4$
$iii)$ $S_R \longrightarrow S_M$
$\therefore \Delta H=\Delta H_i-\Delta H_{i i }=-296.9-(-299.4)=2.5\,kJ$
$CO_{2(g)}$ અને $H_2O$ ના $\Delta H_f$ અનુક્રમે $-395$ અને $ -286$ $kJ \,mol^{-1}$ છે........$KJ$
$2 A ( g ) \rightarrow A _{2}( g )$
$298\, K$ પર $\Delta U^ \ominus,=-20\, kJ\, mol ^{-1}, \Delta S \odot=-30\, J$$K ^{-1}\, mol ^{-1},$ પછી $\Delta G ^{\ominus}$ ........$J$ હશે?