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A solid of 0.5 g in 39.0 g benzene (78 g/mol) lowers vapour pressure from 0.850 to 0.845 bar. What is its molar mass?
A85 g/mol
B340 g/mol
C17 g/mol
D170 g/mol
Answer & Solution
Correct answer: D. 170 g/mol
(0.005/0.850) = (0.5 x 78)/(M x 39) gives M = 170 g per mol.
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