Question

Mole fraction of benzene with toluene is 0.40 calculate weight percentage of benzene

Answer 1

Molecular weight of benzene (C₆H₆) = 78 g/mol
Molecular weight of Toluene (C₆H₅CH₃) = 92 g/mol

Given,mole fraction of benzene = 0.4
Let total number of mole in mixture = 1 mol
Then, mole of Benzene = 0.4 mol
∴ weight of benzene = mole of benzene × molecular weight
= 0.4 × 78 = 31.2g

so, mole fraction of Toluene = 1 - 0.4 = 0.6 [ because,sum of mole fractions of all substances present in mixture = 1 ]
Mole of Toluene = 0.6 mol
∴weight of Toluene = mole of Toluene × molecular weight of Toluene
= 0.6 × 92 = 55.2 g
Now, total weight = 31.2g + 55.2g = 86.4g

Now, weight percentage of benzene = weight of benzene/weight of Toluene ×100
= 31.2/86.4 × 100
= 36.1 %

Answer 2

Answer:

35.88%

Explanation:

Mole fraction of benzene is 0.4 therefore Mole fraction of toulene is 0.6 let the given weight of benzene be x then weight of benzene is100-x now apply the formula of Mole fraction 0.4=x/78/x/78+100-x/92 answer will be 36.11