Question

# A $$5.2$$ molal aqueous solution of methyl alcohol, $$CH_{3}OH$$ is supplied. What is the mole fraction of methyl alcohol in the solution?

A
0.05
B
0.10
C
0.18
D
0.086

Solution

## The correct option is D $$0.086$$ 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 $$\displaystyle = \dfrac { \text { 1000 g } }{ \text { 18 g/mol } } = \text { 55.56 mol }$$The mole fraction of methyl alcohol $$\displaystyle =\dfrac { \text { 5.2 mol } }{ \text { 5.2 mol }+\text { 55.56 mol } } = \text {0.086 }$$.Hence, the correct option is $$D$$Chemistry

Suggest Corrections

0

Similar questions
View More

People also searched for
View More