Choose the one alternative that best completes the statement or answers the question.
Solid NaHCO3 is heated to 90°C. At equilibrium the total pressure of the gases produced is 0.545
atm. Calculate !G° at 90°C for the reaction
2 NaHCO3(s)⇌Na2CO3(s) + H2O(g) + CO2(g).
A) +7.85 kJ
B) +3.67 kJ
C) -7.85 kJ
D) -3.67 kJ