2 HCN (aq) + 1 Ag2CO3 (s) → 2 AgCN (s) + H2O (ℓ) + 1 CO2 (g)

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Reaction Type:

Double Displacement/Decomposition of a Carbonate

Stoichiometry

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HCN            Mass: g  or Solution Volume: mL of Concentration: mol/L
Ag2CO3         Mass: g
AgCN           Mass: g
H2O            Mass: g
CO2            Mass: g  or Gas Volume: L

Enthalpy of Reaction

[2ΔHf(AgCN (s)) + 1ΔHf(H2O (ℓ)) + 1ΔHf(CO2 (g))] - [2ΔHf(HCN (aq)) + 1ΔHf(Ag2CO3 (s))]
[2(146.02) + 1(-285.83) + 1(-393.51)] - [2(60.67) + 1(-505.85)] = -2.78999999999996 kJ
-2.79 kJ     (exothermic)

Entropy Change

[2ΔSf(AgCN (s)) + 1ΔSf(H2O (ℓ)) + 1ΔSf(CO2 (g))] - [2ΔSf(HCN (aq)) + 1ΔSf(Ag2CO3 (s))]
[2(107.19) + 1(69.91) + 1(213.68)] - [2(195.81) + 1(167.36)] = -61.01 J/K
-61.01 J/K     (decrease in entropy)

Free Energy of Reaction (at 298.15 K)

From ΔGf° values:
[2ΔGf(AgCN (s)) + 1ΔGf(H2O (ℓ)) + 1ΔGf(CO2 (g))] - [2ΔGf(HCN (aq)) + 1ΔGf(Ag2CO3 (s))]
[2(156.9) + 1(-237.18) + 1(-394.38)] - [2(38.74) + 1(-436.81)] = 41.57 kJ
41.57 kJ     (nonspontaneous)

From ΔG = ΔH - TΔS:
15.40 kJ     (nonspontaneous)

Equilibrium Constant, K (at 298.15 K)

5.21009750493933E-08
This process is not favorable at 25°C.