calculate the mole fraction of benzene in a solution containing 40% by mass of toluene

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Solution

Dear Student,
Mass of toluene = 40
Mass of benzene = 60
Moles of toluene = 40/92
= 0.43
moles of benzene = 60/78
= 0.76
Total number of moles = 0.43 + 0.76 = 1.19
mole fraction of benzene = 0.76/1.19
= 0.63

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