Question

Find out mole fraction of methanol in 5.2 m solution of methanol​

Answer 1

Answer:

A 5.2 molal aqueous solution of methyl alcohol means that 1 kg ( or 1000 g) of water contains 5.2 moles of methyl alcohol. The molecular weight of water is 18 g/mol.

The number of moles of water

=

18 g/mol

1000 g

= 55.56 mol

The mole fraction of methyl alcohol =

5.2 mol + 55.56 mol

5.2 mol

=0.086

Answer 2

Answer:

Ans = 0.085 in môle fraction

Explanation:

Given

Molality = 5.2m

5.2 m solution meaning 5.2 môles of 1kg of solvent

so no of môles of water=

wt of water/molecular wt of water

1000gm/18

=55.55 môles

we know,

Môles fraction=

no of môles of methanol/no of molécules + no of môles of water

=5.2/5.2 + 55.55

=0.085

Therefore,Môles fraction of methanol is 0.085