Chemistry - Thermodynamics - II Question with Solution | TestHub

At $300\mathrm{K}$, partial pressures of A₂, B₂, and AB are $10^{-2}\mathrm{bar}$, $10^{-2}\mathrm{bar}$, and $10^{-4}\mathrm{bar}$ respectively, for the reaction:

A₂(g) + B₂(g) ⇌ 2AB(g)

Given:

For AB(g): ${\Delta }_f{H}^{}=180kJ/mole$; ${\Delta }_{\mathrm{f}}\mathrm{S}°=210J/mole-\mathrm{K}$

For A₂(g): ${\Delta }_{\mathrm{f}}\mathrm{H}°=60kJ/mole$; ${\Delta }_{\mathrm{f}}\mathrm{S}°=190J/mole-\mathrm{K}$

For B₂(g): ${\Delta }_{\mathrm{f}}\mathrm{H}°=29.5kJ/mole$; ${\Delta }_{\mathrm{f}}\mathrm{S}°=205J/mole-\mathrm{K}$

Use: $2.303\mathrm{R}\times 300=5750J/mole$