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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