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Introduction to Entropy

AP Chemistry· difficulty 2/5

2 H₂(g) + O₂(g) → 2 H₂O(l) 3 mol gas → 2 mol l

What is the sign of ΔS° for this reaction?

  • A

    Cannot be determined

  • B

    Positive; products are simpler

  • C

    Negative; gas moles decrease and form a liquid

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  • D

    Zero

Explanation

Going from 3 mol gas to 2 mol liquid sharply reduces disorder; ΔS° < 0.

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