$SO_3 + H_2O $$\to$$ H_2SO_4$ : $\Delta$$H_3 = -130.2$ કિલોજૂલ અને $H_2 + 1/2$ $O_2$ $\to$ $H_2O$ : $\Delta H_4 = -287.3$ કિલોજૂલ
સમીકરણનો સરવાળો કરતાં: $S + 2O_2 + H_2 → H_2SO_4$
$\Delta {H_{{H_2}S{O_4}}}\,\, = \Delta {H_1} + \Delta {H_2} + \Delta {H_3} + \Delta {H_4}\,\, = \,\, - 814.4$ કિલોજૂલ
$3 HC \equiv CH _{( g )} \rightleftharpoons C _{6} H _{6(\ell)}$
[આપેલ : $\Delta_{f} G ^{\circ}( HC \equiv CH )=-2.04 \times 10^{5}\, J mol ^{-1}$
$\Delta_{f} G ^{\circ}\left( C _{6} H _{6}\right)=-1.24 \times 10^{5}\, J mol ^{-1} ; R =8.314\,\left. J K ^{-1} mol ^{-1}\right]$
આપેલ : $\Delta H ^{\circ}=-54.07\,kJ\,mol ^{-1}$
$\Delta S ^{\circ}=10\,J\,K ^{-1}\,mol ^{-1}$
$(2.303 \times 8.314 \times 298=5705$ લો.)