Statement 1: The van der Waals constant a for NH₃ is larger than that for He, because NH₃ has much stronger intermolecular attractions.
Statement 2: The constant b measures the excluded volume per mole of the gas.

Question

Statement 1: The van der Waals constant a for NH₃ is larger than that for He, because NH₃ has much stronger intermolecular attractions.

Statement 2: The constant b measures the excluded volume per mole of the gas.

TestHub · Accepted Answer

Statement I is correct: a measures attraction strength, and polar NH₃ attracts far more strongly than inert He. Statement II is correct as the meaning of b. But the excluded volume per mole says nothing about attraction strengths, so II does not explain the a-comparison in I. Both correct, II not the explanation. Ans: (b).

Chemistry - Real Gas Question with Solution | TestHub

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