Question

A 250 mL water solution containing 48 g of sucrose (molecular mass = 342) at 300 K is separated from pure water by means of a semipermeable membrane. What pressure must be applied on solution as to prevent osmosis?

• A. 11.8 atm
• B. 12.8 atm
• C. 13.8 atm
• D. 14.8 atm

Answer 1

Answer: (C)

13.8 atm

we have,

$\pi =C\ast R\ast T$

$\pi =\frac{48\ast 1000}{342\ast 250}\ast 300\ast 0.082$

$\pi =13.81atm$