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Vapour pressure of aq solution of cane sugar is 75.6 cm of hg at 100c what is molality of solution.

Vapour pressure of aq solution of cane sugar is 75.6 cm of hg at 100c what is molality of solution.

Grade:10

1 Answers

Arun
25750 Points
6 years ago
The vapor pressure of pure water at 100°C is 76.0 cmHg. 
The mole fraction of water in the solution is: 
(75.6 cmHg) / (76.0 cmHg) = 0.994737 
The mole fraction of sugar in the solution is: 
1 - 0.994737 = 0.005263 
Take a hypothetical sample of exactly 1 mole of the solution: 
(0.994737 mol H2O) x (18.01532 g H2O/mol) = 17.9205 g = 0.0179205 kg 
(0.005263 mol sugar) / (0.0179205 kg) = 0.29368 mol/kg = 0.294 m sugar

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