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Adding 1.0 mol of sucrose to 1 kg of water lowers its vapour pressure about as much as adding which solute?
A1.0 mol of NaCl
B2.0 mol of urea
C0.5 mol of urea
D1.0 mol of urea
Answer & Solution
Correct answer: D. 1.0 mol of urea
Lowering of vapour pressure depends on the number of non-volatile, non-ionising solute particles, so 1 mol urea matches 1 mol sucrose.
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