Chemistry - Thermodynamics - II Question with Solution | TestHub

The direct conversion of A to B is difficult, hence it is carried out by the following shown path
$\underset{\stackrel{\uparrow }{\mathrm{A}}}{\mathrm{C}}\to \underset{\stackrel{\downarrow }{\mathrm{B}}}{\mathrm{D}}$
Given
$\mathrm{\Delta }\mathrm{S}(\mathrm{A}\to \mathrm{C})=50$e.u.
$\mathrm{\Delta }\mathrm{S}(\mathrm{C}\to \mathrm{D})=30$e.u.
$\mathrm{\Delta }\mathrm{S}(\mathrm{B}\to \mathrm{D})=20$e.u.
where e.u. is entropy unit then$\mathrm{\Delta }\mathrm{S}(\mathrm{A}\to \mathrm{B})$in e.u. is