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Sodium carbonate, Na2CO3(s), can be prepared by heating sodium bicarbonate, NaHCO3(s). 2NaHCO3(s) → Na2CO3(s) + CO2(g) + H2O(g) Kp = 0.23 at 100 ºC If a sample of NaHCO3 is placed in an evacuated flask and allowed to achieve equilibrium at 100 ºC, what will the total gas pressure be?