(Solved):   Question 4 (17 marks) The gas-phase reaction at 2 bar and \( 400 \mathrm{~K} \) is shown a ...

 

Question 4 (17 marks) The gas-phase reaction at 2 bar and \( 400 \mathrm{~K} \) is shown as \( \mathbf{2 A}(\mathbf{g})+\mathbf{B}(\mathbf{g}) \leftrightharpoons \mathbf{3 C}(\mathbf{g})+\mathbf{2 D}(\mathbf{g}) \) Initially, the reactor contains \( 2.1 \mathrm{~mol} \mathrm{~A}, 0.75 \mathrm{~mol} \mathrm{~B} \) and \( 0.25 \mathrm{~mol} \mathrm{D} \). At equilibrium, \( 1.25 \mathrm{~mol} \) \( \mathrm{C} \) was formed. Determine the standard Gibbs reaction energy, \( \Delta_{r} G^{0} \) at equilibrium.