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For the reaction, 

2Cl(g) → Cl2(g), what are the signs of ∆H and ∆S ? 

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∆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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