Physical Chemistry 1 Quiz
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The decomposition 2NaHCO3(s)⇌Na2CO3(s)+H2O(g)+CO2(g)2\text{NaHCO}_3(s) \rightleftharpoons \text{Na}_2\text{CO}_3(s) + \text{H}_2\text{O}(g) + \text{CO}_2(g) has an equilibrium constant expression Kp=PH2O⋅PCO2K_p = P_{H_2O} \cdot P_{CO_2}. At 400 K, ΔH∘=129.3 kJ/mol\Delta H^\circ = 129.3 \text{ kJ/mol} and ΔS∘=334.9 J/(mol⋅K)\Delta S^\circ = 334.9 \text{ J/(mol}\cdot\text{K)}. What partial pressure of water vapor is present at equilibrium at this temperature if PCO2=0.75 atmP_{CO_2} = 0.75 \text{ atm}?
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