## 2 BrCl (g) → Br2 (g) + Cl2 (g)

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Decomposition

## Stoichiometry

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 Heat Added: kJ BrCl           Mass: g or Gas Volume: L Br2            Mass: g or Gas Volume: L Cl2            Mass: g or Gas Volume: L

## Enthalpy of Reaction

[1ΔHf(Br2 (g)) + 1ΔHf(Cl2 (g))] - [2ΔHf(BrCl (g))]
[1(30.91) + 1(0)] - [2(14.64)] = 1.63 kJ
1.63 kJ     (endothermic)

## Entropy Change

[1ΔSf(Br2 (g)) + 1ΔSf(Cl2 (g))] - [2ΔSf(BrCl (g))]
[1(245.35) + 1(222.97)] - [2(239.99)] = -11.66 J/K
-11.66 J/K     (decrease in entropy)

## Free Energy of Reaction (at 298.15 K)

From ΔGf° values:
[1ΔGf(Br2 (g)) + 1ΔGf(Cl2 (g))] - [2ΔGf(BrCl (g))]
[1(3.14) + 1(0)] - [2(-0.96)] = 5.06 kJ
5.06 kJ     (nonspontaneous)

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

## Equilibrium Constant, K (at 298.15 K)

0.12986048689
This process is close to or at equilibrium at 25°C.