NEETChemistry-Solutions
NEET Chemistry Raoult's Law MCQ Question
Type: MCQ-numerical-Hard-Class 12
Vapour pressure of benzene at 30°C is 121.8 mm. When 15 g of a non volatile solute is dissolved in 250 g of benzene, its vapour pressure decreased to 120.2 mm. The molecular weight of the solute (Mo. wt. of solvent = 78)
A
356.2
B
456.8
C
530.1
D
656.7
Correct Answer
Option A
Detailed Explanation
Using Raoult's law, the decrease in vapor pressure is used to calculate the molar mass of the solute. The calculation gives a molar mass of approximately 356.2 g/mol.
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