∆rGP, T =∆rG1,Tref −∆r S1,Tref (T−Tref)+∆rVsP ∆rGP, T =∆rH1,Tref −T∆rS1,Tref +∆rVsP
The data at 298 K and 1 bar for the reaction grossular + α-quartz = anorthite + 2 wollastonite
are: ∆rH° = 49.67 kJ/mol
∆rS° = 63.89 J K-1 mol-1
∆rVs° = 32.66 cm3/mol
(ignore heat capacity)
A. Calculate ∆rG for the reaction at 1100 K and 5 kbar.
B. Calculate ∆rG for the reaction at 1100 K and 10 kbar.
C. Calculate the equilibrium pressure of the reaction at 500 K.
D. Calculate the equilibrium temperature of the reaction at 3 kbar.
E. Draw the position of the reaction in PT space.