Q 2.17 The vapour pressure of water is 12.3 kPa at 300 K. Calculate vapour pressure of 1 molal solution of a non-volatile solute in it.

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Vishal Baghel | Contributor-Level 10

8 months ago

Given: 1 molal solution means 1 mole of solute present in 1000g of water solvent)

Molecular weight of water = H₂O = 1 * 2 + 16 = 18g/mol

No. of moles of water, n = given mass /molecular weight

⇒ n = 1000/18 = 55.56 gmol^-1

Mole fraction of solute in solution, x₂ = moles of solute/ (moles of solute + mole

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