# Chemistry Class 12 NCERT Solutions: Chapter 2 Solutions Part 17

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Q: 40: Determine the amount of dissolved in litre of water such that its osmotic pressure is .

Answer:

We know that,

Here,

Therefore, w

Hence, the required amount of is

Q: 41. Determine the osmotic pressure of a solution prepared by dissolving of in 2 liter of water at , assuming that it is completely dissociated.

Answer:

When is dissolved in water, ions are produced.

Total number of ions produced

Given,

Also, we know that:

Appling the following relation,