## H2 (g) + 1 Cl2 (g) → 2 HCl (g)

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Synthesis

## Stoichiometry

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 H2             Mass: g or Gas Volume: L Cl2            Mass: g or Gas Volume: L HCl            Mass: g or Gas Volume: L Heat Released: kJ

## Enthalpy of Reaction

[2ΔHf(HCl (g))] - [1ΔHf(H2 (g)) + 1ΔHf(Cl2 (g))]
[2(-92.3)] - [1(0) + 1(0)] = -184.6 kJ
-184.60 kJ     (exothermic)

## Entropy Change

[2ΔSf(HCl (g))] - [1ΔSf(H2 (g)) + 1ΔSf(Cl2 (g))]
[2(186.77)] - [1(130.59) + 1(222.97)] = 19.98 J/K
19.98 J/K     (increase in entropy)

## Free Energy of Reaction (at 298.15 K)

From ΔGf° values:
[2ΔGf(HCl (g))] - [1ΔGf(H2 (g)) + 1ΔGf(Cl2 (g))]
[2(-95.31)] - [1(0) + 1(0)] = -190.62 kJ
-190.62 kJ     (spontaneous)

From ΔG = ΔH - TΔS:
-190.56 kJ     (spontaneous)

## Equilibrium Constant, K (at 298.15 K)

2.4948094462e+033
This process is favorable at 25°C.