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A solution of lactose containing 8.45 g ...

A solution of lactose containing 8.45 g of lactose in 100g of water has a vapour pressure of 4.559 mm of Hg at `0^(@)C`. If the vapour pressure of pure water is 4.579 of Hg, calculate the molecular weight of lactose.

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To calculate the molecular weight of lactose from the given data, we will use Raoult's Law and the concept of vapor pressure lowering. Here’s a step-by-step solution: ### Step 1: Identify the given data - Mass of lactose (solute), \( W_2 = 8.45 \, \text{g} \) - Mass of water (solvent), \( W_1 = 100 \, \text{g} \) - Vapor pressure of pure water, \( P_0 = 4.579 \, \text{mmHg} \) - Vapor pressure of the solution, \( P = 4.559 \, \text{mmHg} \) ...
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