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Solid NaHCO3 is heated to 90°C. At equilibrium the total pressure of the gases produced is...

Solid NaHCO3 is heated to 90°C. At equilibrium the total pressure of the gases produced is 0.545 atm. Calculate ΔG° at 90°C for the reaction 2 NaHCO3(s) ⇌ Na2CO3(s) + H2O(g) + CO2(g).

I know to get the answer I have to do (-.008314*363)*ln((.545/2)^2)=7.85

I dont understand why I divide .545 by two and square my answer, could you please explain? Thank you!

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