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30% benzene (78 g/mol) by mass in CCl4 (154 g/mol). Mole fraction of benzene?
A0.300
B0.458
C0.385
D0.542
Answer & Solution
Correct answer: B. 0.458
In 100 g, benzene is 30/78 = 0.385 mol and CCl4 is 70/154 = 0.455 mol, so x = 0.385/0.840 = 0.458.
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