Question

calulate the molar mass of solute if 15 g dissolve in 200ml of solution at 298k having osmotic pressure 1.5 atm​

Answer 1

Answer:

Osmotic pressure is:

π=CRT

where π= osmotic pressure

C=concentration

R=gas constant = 0.0821 atm L/K/mol

T= temperature

C=molesof solute/volume of solution

Assuming density of solution be 1g/mL

volume of 1000g water=1000mL=1L

solute is sucrose C

12

H

22

O

11

(M

C

12

H

22

O

11

=342g/mol)

n=mass/molar mass

given that solution contains 68.4 g sucrose

Thus n

C

12

H

22

O

11

=

342

68.4

=0.2

thus C=

1

0.2

=0.2M

π=0.2×0.0821×298

π=4.89 atm

Explanation:

hope it helped you