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According to Raoult's law, p° - p / p° = xB. xB Mole fraction of solute = 2 / 2 + 8.5. P = 60 mm of Hg. p° - p / p° = 1 / 5 or 4p° = (P)x5. p° = 60 × 5 / 4 = 75 mm of Hg.

1. p° - p / p° = xB
2. xB Mole fraction of solute = 2 / 2 + 8.5
3. P = 60 mm of Hg
4. p° = 75 mm of Hg

Correct answer: p° = 75 mm of Hg

Solution

The calculation for p° = 75 mm of Hg is correct based on the given data and Raoult's law. It uses the relationship between vapor pressure lowering and mole fraction.

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