Question
A solution is prepared by dissolving 68 g sucrose in 1 kg water. Calculate the vapour pressure of solution at 298 K. [vapour pressure of water at 298 K = 18 mm of Hg & mole fraction of solvent = 0.9964]
MHT CET
Chemistry
Solutions
2026
MHT CET 2026 (13 April Shift 2)
MHT CET Chemistry Question (2026) — Solution
Options
- A. 17.93 mm Hg
- B. 17.80 mm Hg
- C. 17.76 mm Hg
- D. 17.68 mm Hg
Answer
A. 17.93 mm Hg
Step-by-step solution
According to Raoult's law, the vapour pressure of a solution containing a non-volatile solute is given by: P_ s = P^ X_ solvent Given: P^ = 18 mm Hg X_ solvent = 0.9964 Substituting the values: P_ s = 18 0.9964 = 17.9352 mm Hg Rounding off, we get 17.93 mm Hg. Answer: 17.93 mm Hg
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