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Calculate the mole fraction of benzene in solution containing 30% by mass in carbon tetrachioride.

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30% of benzene in carbon tetrachloride by mass means that Mass of benzene in the solution = 30g 

Mass of solution = 100 g 

Mass of carbon tetrachloride = 100g – 30g = 70g 

Molar mass of benzene (C6H6) = 78 g mol-1

Molar mass of CCl4 = 12 + (4 x 35.5) = 154 g mol-1

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