Question

115 ml of ethanol(C2H6O) {density=0.8g/ml} on mixing with 99 ml water gives 200 ml solution.
The numerical values of molarity,molality and mole fraction of ethanol respectively are?
(A)10,20.2,0.267
(B)20.2,10,0.267
(C)10,20.2,0.733
(D)20.2,10,0.733
Plz give explanation
Long question that's why I will give
50 points just give correct answer​

Answer 1

Answer:

No. of moles of ethyl alcohol =

Molar mass

Volume×density

=

46

50×0.789

=0.8576

No. of moles of water =

Molar mass

Volume×density

=

18

50×1

=2.7777

Molarity =

Vol.ofsol.in mL

No.of moles

×1000

=

95

0.8576

×1000=9.027M

Molality =

Mass of solvent in grams

No.of moles of solute

×1000

=

50

0.8576

×1000=17.152m

Mole fraction =

0.8576+2.7777

0.8576

=

3.6353

0.8576

=0.236