A set of solutions is prepared using 180 g of water as a solvent and 10 g of different non-volatile solutes A, B and C. The relative lowering of vapour pressure in the presence of these solutes are in

Question

A set of solutions is prepared using 180 g of water as a solvent and 10 g of different non-volatile solutes A, B and C. The relative lowering of vapour pressure in the presence of these solutes are in the order

[Given, molar mass of A = 100 g mol⁻¹; B = 200 g mol⁻¹; C = 10,000 g mol⁻¹]

Canvas Classes · Accepted Answer

Strategy:
 Relative lowering of vapour pressure (RLVP) is a colligative property defined by . Since the mass of solute and solvent are the same, RLVP is inversely proportional to the molar mass of the solute.

Step 1: Compare moles of each solute
Common mass = 10 g.
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Step 2: Relate moles to RLVP
For a fixed amount of solvent (180 g water = 10 mol), higher moles of solute result in a higher mole fraction, and thus higher RLVP.
Order: .

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