BCl3 (g) + 3 H2O (ℓ) → H3BO3 (s) + 3 HCl (g)

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Stoichiometry

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BCl3           Mass: g  or Gas Volume: L
H2O            Mass: g
H3BO3          Mass: g
HCl            Mass: g  or Gas Volume: L
Heat Released: kJ

Enthalpy of Reaction

[1ΔHf(H3BO3 (s)) + 3ΔHf(HCl (g))] - [1ΔHf(BCl3 (g)) + 3ΔHf(H2O (ℓ))]
[1(-1094.33) + 3(-92.3)] - [1(-403.76) + 3(-285.83)] = -109.98 kJ
-109.98 kJ     (exothermic)

Entropy Change

[1ΔSf(H3BO3 (s)) + 3ΔSf(HCl (g))] - [1ΔSf(BCl3 (g)) + 3ΔSf(H2O (ℓ))]
[1(88.83) + 3(186.77)] - [1(289.99) + 3(69.91)] = 149.42 J/K
149.42 J/K     (increase in entropy)

Free Energy of Reaction (at 298.15 K)

From ΔGf° values:
[1ΔGf(H3BO3 (s)) + 3ΔGf(HCl (g))] - [1ΔGf(BCl3 (g)) + 3ΔGf(H2O (ℓ))]
[1(-969.01) + 3(-95.31)] - [1(-388.74) + 3(-237.18)] = -154.66 kJ
-154.66 kJ     (spontaneous)

From ΔG = ΔH - TΔS:
-154.53 kJ     (spontaneous)

Equilibrium Constant, K (at 298.15 K)

1.2495895846e+027
This process is favorable at 25°C.

Reference(s):

Silberberg, Martin S. Chemistry: The Molecular Nature of Matter and Change 4th ed.; McGraw-Hill: Boston, MA, 2006; p 127.

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