Question

mole fraction of ethyl alcohol in aqueous ethyl alcohol is 0.25. calculate molality of solution​

Answer 1

Explanation:

Molefractionofethanol(C

2

H

5

OH)=0.25=

n

1

+n

2

n

1

Molefractionofwater(H

2

O)=0.75=

n

1

+n

2

n

2

∴

n

2

n

1

=

0.75

0.25

=

3

1

C

2

H

5

OH=n

1

=1mole=46g

H

2

O=n

2

=3moles=54g

Totalmass=46+54=100g

Thus, it is 46% ethanol by weight of solution and 54% water by weight of solution.