(2001.F.2) Consider the case where a gas reacts with a solid to form a second gas: 2A(g)+B(s) ? A$_2$B(g)
At the reaction temperature, the dimensionless free energy of reaction, ?G°/RT, is 0.814, and the solid has a
sublimation pressure of 3.2×10$^{-6}$ bar.
a. Beginning with an initial vapor composition of pure A and an excess of pure B, determine the equilibrium
composition of the vapor phase when the reaction occurs at a pressure of 1.81 bar.
b. For which species does the mole fraction in the vapor phase increase as the pressure increases?
c. Beginning with an excess of B and an initial vapor composition that is an equimolar mixture of A and C (an inert
vapor that does not participate in the reaction), determine the equilibrium vapor composition at 1.81 bar.