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At certain temperatures a 5.12% solution...

At certain temperatures a 5.12% solution of cane sugar is isotonic with a 0.9% solution of an unknown solute. The molar mass of solute is :

A

60

B

46.17

C

120

D

90

Text Solution

Verified by Experts

The correct Answer is:
A
"Solutions having same osmotic pressure are called isotonic solutions." The osmotic pressure is given as :
`because" "pi=(w_(B)RT)/(VM_(B))`
`pi" (cane sugar)"=pi"(unknown solute)"`
`" "(5.12)/(342)=(0.9)/M`
`" "M=(342 times 0.9)/(5.12)`
`" "=60`
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