Question

A solution is prepared by adding 60 gm of methyl alcohol to 120 gm of water. Calculate the mole fraction of methyl of methyl alcohol in it.​

Answer 1

Answer:

0.219

Explanation:

weight of methyl alcohol = 60gm

Molecular weight of methyl alcohol = 32 gm/mol

Number of moles of methly alcohol = wt./mol wt. = 60/32 = 1.875 = n(A)

weight of water = 120gm

Molecular weight of water = 18 gm/mol

Number of moles of water = wt./mol wt. = 120/18 = 6.667 = n(B)

Mole fraction of methyl alcohol = n(A)

n(A) + n(B)

Mole fraction of methyl alcohol = 1.875

1.875+6.667

Mole fraction of methyl alcohol = 1.875/8.542 = 0.219 or 0.22