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Asked by lovemaan5500 | 30 Jan, 2019, 12:01: PM
Expert Answer
Given:
 
Mole fraction of benzene = 0.4 
 
Total number of moles in a solution = 1
 
No. of moles of benzene = 0.4 mol
 
Weight of benzene = no. of moles × molecular mass
 
                            = 0.4 × 78
 
                             = 31.2 g
 
Mole fraction of toluene = 0.6 
 
Moles of toluene = 0.6 mol
 
Weight of toluene = 0.6 × 92.14
 
                           = 55.28 g
 
Total weight = 31.2 + 55.28 
 
                   =86.48
 
Weight space percent space of space benzene space space equals fraction numerator Weight space of space benzene over denominator Total space weight end fraction cross times 100

space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals fraction numerator 31.2 over denominator 86.48 end fraction cross times 100


space Weight space percent space of space benzene space space equals 35.84 percent sign
 
Weight percent of benzene is 35.84%
Answered by Varsha | 30 Jan, 2019, 05:22: PM
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