${H_2}C = C{H_2}(g) + {H_2}(g) \to {H_3}C - C{H_3}(g)$
$H_2$$_{(g)} +$ $1/2O_2$ $_{(g)}$ $\rightarrow$ $H_2$$O$$_{(l)}$; $\Delta H= -$ $285.77\, KJ\, mol$$^{-1}$; $H_2$$_{(g)} +$ $1/2O_2$$_{(g)}$ $\rightarrow$ $H_2O$ $_{(g)}$; $\Delta H$ $ = - 241.84\, KJ \,mol$$^{-1}$
પ્રક્રમ | $\Delta H / kJ\,mol ^{-1}$ | $\Delta S / J K^{-1}$ |
$A$ | $-25$ | $-80$ |
$B$ | $-22$ | $40$ |
$C$ | $25$ | $-50$ |
$D$ | $22$ | $20$ |
${H_{2\left( g \right)}} + 1/2{O_{2\left( g \right)}} \to {H_2}{O_{\left( l \right)}};\Delta {H_2}$ હોય, તો