Question

find w/v if w/w % of ethanol is 20% and also find mole fraction, molarity, molality il density of solution is 1 g/ml ​

Answer 1

Answer:

C

2

H

5

OH is 20% by volume i.e. 20 mL of C

2

H

5

OH is dissolved in 100 mL of solution.

Volume of H

2

O=100−20=80 mL

Weight of H

2

O=80×1=80 g (d

H

2

O

=1 g/cc)

Weight of solution =100×0.96=96 g

Weight of C

2

H

5

OH=96−80=16 g

Molecular weight of C

2

H

5

OH=12×2+5+16+1=46 g/mol

M=

Mw

2

×V

sol

W

2

×1000

=

46×100

16×1000

=3.48M

m=

Mw

2

×W

1

W

2

×1000

=

46×80

16×1000

=4.35m

Explanation:

Hope it will help you