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The molar mass of PH3 (34.00 g/mol) is larger than that of NH3 (17.03 g/mol), but the boiling point of NH3 (-33 C) is

The molar mass of PH3 (34.00 g/mol) is larger than that of NH3 (17.03 g/mol), but the boiling point of NH3 (-33 C) is higher than that of PH3 (-87 C). Explain why this makes sense.

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