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A 30% by mass benzene (78 g/mol) in CCl4 (154 g/mol) solution has what mole fraction of benzene?
A0.459
B0.300
C0.385
D0.541
Answer & Solution
Correct answer: A. 0.459
30 g is 0.385 mol and 70 g is 0.455 mol, so x = 0.385/0.840, which is 0.459.
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