Sodium bicarbonate decomposes to sodium carbonate by the reaction shown below. W

Question

Sodium bicarbonate decomposes to sodium carbonate by the reaction shown below. What is deltaS0 non (kJ/mol) for this reaction at 25degreeC? Estimate delta G0 (kJ/mol) at 100 degreeC. At what temperature (degreC) does the reaction become spontaneous? Calculate the equilibrium constant for the reaction at 25degree and 100 degreeC. What is the deltaGnon at 25 degreeC if the PCO2 = 0.500 atm and the PH2O = 0.750 atm? What key assumption is made in the calculations (b) and (c)? Assumption: endothermic 2NaHCO3(s) rightarrow Na2CO3(s) + CO2(g) + H2O(g), At 25degreeC deltaH0non = +128.9 kJ/mol and deltaG0non = +33.1kJ/mol.

Explanation / Answer

a.

dGrnx = dHorxn - TdS orxn          

dS orxn = (dHorxn - dGrnx) / T

            = (+128.9 kJ/mol

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