c
\(\Delta {\text{S}}\)(પ્રક્રિયા)\( = \,\sum {\Delta {{\text{S}}^ \circ }} \)(નીપજો) \({\text{ -  }}\sum {\Delta {{\text{S}}^ \circ }} \)(પ્રક્રિયકો)

\( = \Delta {{\text{S}}^ \circ }_{X{Y_3}} - [\frac{1}{2}\Delta {S^ \circ }_{{X_2}} + \frac{3}{2}\Delta {S^ \circ }_{{Y_2}} = 50 - [\frac{1}{2} \times 60 + \frac{3}{2} \times 40]\, = 50 - [30 + 60]\, =  - 40\,\,sq \div \,\,{{\text{K}}^{{\text{ - 1}}}}\,\)

\(\Delta {\text{G}} = \Delta H - T\Delta S\) સંતુલને \(\Delta {\text{G}} = {\text{0}}\,\,\,\,\,\therefore \,\,\Delta {\text{H}} = {\text{T}}\Delta {\text{S}}\,\,\,\,\,\,{\text{T}} = \frac{{\Delta {\text{H}}}}{{\Delta {\text{S}}}} = \frac{{ - 3000}}{{ - 40}} = 750\,K\)