Question

If the evaporation of pure water is 23.5 mmHg, calculate the evaporation of 5% w / w urea aqueous solution.​

Answer 1

Answer:

Calculate the vapour pressure of an aqueous solution which contains 5 mass per cent of urea. The vapour pressure of pure water is 23.5 mm Hg. Molar mass ...

Explanation:

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Answer 2

Answer:

Mass of urea =5 g

Mass of water =100−5=95 g

Number of moles of urea =

60

5

=0.083

Number of moles of water =

18

95

=5.278

∴ Total number of moles =5.278+0.083=5.361

Mole fraction of solvent =

5.361

5.278

P

s

= Mole fraction of solvent ×P

o

=

5.361

5.278

×23.5

= 23.14 mm Hg ≈ 23 mm Hg