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Spontaneity

Fou the react...

Question

Fou the reaction.
${2 C l}_{(g)} ⟶ {C l}_{2 (g)}$ What are the signs of $Δ H$ and $Δ S ?$

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Solution

∆H and ∆S are negative
The given reaction represents the formation of chlorine molecule from chlorine atoms. Here, bond formation is taking place. Therefore, energy is being released. Hence, ∆H is negative. Also, two moles of atoms have more randomness than one mole of a molecule. Since spontaneity is decreased, ∆S is negative for the given reaction.

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