$C(s)\,\, + \,\,\frac{1}{2}\,{O_2}(g)\, \to \,CO(g),\,\Delta H\,\, = \,\, - \,110.5\,\,kJ$

આ સમીકરણ માટે $\Delta n$ $=$ નિપજના વાયુમય મોલની સંખ્યા $-$ પ્રક્રિયકોના વાયુમય મોલની સંખ્યા

$ = \,\,1\,\, - \,\,\frac{1}{2}\,\, = \,\, + \,\frac{1}{2}\,$

$R\, = \,\,8.314\,\, \times \,\,{10^{ - 3}}\,kJ/K/mol.,\,\,\,\,T\,\, = \,\,298\,K$

હવે,$\Delta H = \Delta E + \Delta n RT$

$\Delta$$E$  અચળ કદે પ્રમાણિત પ્રક્રિયા ઉષ્મા $= ?$

આથી  $ - 110.5\,\, = \,\,\Delta E\,\, + \,\,( + \frac{1}{2})\,\, \times \,\,8.314\,\, \times \,\,{10^{ - 3}}\, \times \,\,{\text{298}}$

$\Delta {\text{E}}{\mkern 1mu} {\mkern 1mu}  = {\mkern 1mu} {\mkern 1mu} {\text{(  -  110}}{\text{.5}}{\mkern 1mu} {\mkern 1mu} {\text{  -  }}{\mkern 1mu} {\mkern 1mu} \frac{{\text{1}}}{{\text{2}}}{\mkern 1mu} {\mkern 1mu}  \times {\mkern 1mu} {\mkern 1mu} {\text{8}}{\text{.314}}{\mkern 1mu} {\mkern 1mu}  \times {\mkern 1mu} {\mkern 1mu} {\text{1}}{{\text{0}}^{{\text{  -  3}}}}{\mkern 1mu}  \times {\mkern 1mu} {\mkern 1mu} {\text{298)}}\,{\text{kJ/mol}}{\text{.}}$

$ = \,\,{\text{( - 110}}{\text{.5}}\,\,{\text{ - }}\,\,{\text{1}}{\text{.238)}}\,\,{\text{kJ/mol}}{\text{.}}\,\, = \,\,{\text{ - 111}}{\text{.738}}\,\,\,{\text{kJ/mol}}{\text{. }}$