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Thermodynamics

Question
CBSEENCH11006299

For the reaction,
   2 Cl left parenthesis straight g right parenthesis space rightwards arrow space Cl subscript 2 left parenthesis straight g right parenthesis comma space what space are space the space signs space of space increment straight H space and space increment straight S ?

Solution

incrementH and incrementS are negative.

The given reaction represents the formation of chlorine molecule from chlorine atoms. here, the bond formation is taking place. Therefore, energy is being released. Hence, incrementH is negative.
Also, two moles of atoms have more randomness than one mole of molecules. Since spontaneity is decreased, incrementS is negative for the given reaction.