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For a spontaneous process in an isolated system, which statement is correct?

A $Δ S_{sys} > 0$
B $Δ S_{sys} < 0$
C $Δ S_{sys} = 0$
D $Δ H < 0$ is required

Answer: A

An isolated system exchanges no heat with its surroundings, so

Δ S_{t o t a l} = Δ S_{sys}

. The second law requires

Δ S_{t o t a l} > 0

for a spontaneous process, so

Δ S_{sys} > 0

.

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