${H_2}{O_{(g)}} + {C_{(s)}}\, \to \,\,C{O_{(g)}} + {H_{2(g)}}\,:\,\,\Delta H\, = \,\,131$ કિલોજૂલ $C{O_{(g)}} + \,\,\frac{1}{2}\,\,{O_{2(g)}} \to \,\,C{O_{2(g)}}\,:\,\,\Delta H\,\, = \,\, - 282$ કિલોજૂલ 

${H_{2(g)}} + \frac{1}{2}{O_{2(g)}} \to \,{H_2}{O_{(g)}}\,:\,\Delta H\,\, = \,\, - 242\,\,$ કિલોજૂલ

$C_{(g)} + O_2$$_{(g)}$ $\to$ $CO_2$$_{(g)}$ : $\Delta H = x$ કિલોજૂલ