$\mathrm{W}=-2.303 \mathrm{nRT} \log \left(\frac{\mathrm{V}_2}{\mathrm{~V}_1}\right)$
$=-2.303 \times 5 \times 8.314 \times 300 \log \left(\frac{100}{10}\right)$
$=-28720.713 \mathrm{~J}$
$\equiv-28721 \mathrm{~J}$
$3 HC \equiv CH _{( g )} \rightleftharpoons C _{6} H _{6(\ell)}$
[આપેલ : $\Delta_{f} G ^{\circ}( HC \equiv CH )=-2.04 \times 10^{5}\, J mol ^{-1}$
$\Delta_{f} G ^{\circ}\left( C _{6} H _{6}\right)=-1.24 \times 10^{5}\, J mol ^{-1} ; R =8.314\,\left. J K ^{-1} mol ^{-1}\right]$
${N_2} + 3{H_2}$ $\rightleftharpoons$ $2N{H_3}$
($0\,^oC$ તાપમાને બરફના પાણીમાં થતા રૂપાંતર માટે એન્થાલ્પી ફેરફાર $6.0\, k\,J\, mol^{-1}$ છે.)