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Mass of benzene = 30

molar mass of benzene = 78

moles of benzene = 30/78

 = 0.38

mass of carbon tetrachloride = 70

molar mass of carbon tetrachloride = 154

moles of carbon tetrachloride = 70/154

 = 0.45

total number of moles = 0.38 + 0.45 = 0.83

mole fraction of benzene = 0.38 / 0.83

 = 0.45

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