Mass of Urea () required to be dissolved in 1000 g of water in order to reduce the vapour pressure of water by 25% is g. (Nearest integer)

Given: Molar mass of N, C, O and H are 14, 12, 16 and 1 g m

Question

Mass of Urea () required to be dissolved in 1000 g of water in order to reduce the vapour pressure of water by 25% is  g. (Nearest integer)

Given: Molar mass of N, C, O and H are 14, 12, 16 and 1 g mol⁻¹ respectively.

Canvas Classes · Accepted Answer

Strategy:
 Colligative properties depend only on the number of solute particles, not their nature.

Properties:
1. Lowering of VP: Colligative.
2. Elevation of BP: Colligative.
3. Depression of FP: Colligative.
4. Osmotic Pressure: Colligative.

Vapor pressure itself is NOT a colligative property; the lowering of it is.

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