Urea forms an ideal solution in water. Determine the vapour pressure of an aqueous solution contains 10% by mass of urea at 40⁰C. (Vapour pressure of water at 40⁰C = 55.3 mm of Hg)

Solution

Answer:

$\frac{p ° - p}{p °}$ = x_urea

Let the mass of solution be 100g
therefore mass of urea = 10 g
molecular mass of urea = 60 g

x_urea = 10/60 =1/6

molecular mass of water = 18g
x_water = 90/18 =5

$x_{urea} = \frac{mole fraction of urea}{total mole fraction of solution} x_{urea} = \frac{1 / 6}{1 / 6 + 5} = \frac{1 / 6}{31 / 6} x_{urea} = 1 / 31 using above formula \frac{55.3 - p}{55.3} = \frac{1}{31} 55.3 - p = \frac{55.3}{31} p = 55.3 - \frac{55.3}{31} 55.3 (1 - \frac{1}{31}) = p p = 55.3 \times \frac{30}{31} p = 53.52 mm Hg$

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Solutions

Urea forms an ideal solution in water. Determine the vapour pressure of an aqueous solution contains 10% by mass of urea at 40⁰C. (Vapour pressure of water at 40⁰C = 55.3 mm of Hg)

Some More Questions From Solutions Chapter

Calculate the osmotic pressure in pascals exerted by a solution prepared by dissolving 1.0 g of polymer of molar mass 185,000 in 450 mL at 37⁰C.

Suppose a solid solution is formed between two substances, one whose particles are very large and the other whose particles are very small. What kind of solid solution is this likely to be?

Amongst the following compunds identify which are insoluble, partially soluble and highly soluble in water?
(i) phenol (ii) toluene (iii) formic acid (iv) ethylene glycol (v) chloroform, (vi) pentanol.

Two liquids A and B boils at 145⁰C and 190⁰C respectively. Which of them has a higher vapour pressure at 80⁰C ?

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Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

Urea forms an ideal solution in water. Determine the vapour pressure of an aqueous solution contains 10% by mass of urea at 40⁰C. (Vapour pressure of water at 40⁰C = 55.3 mm of Hg)

Calculate the osmotic pressure in pascals exerted by a solution prepared by dissolving 1.0 g of polymer of molar mass 185,000 in 450 mL at 37⁰C.

Amongst the following compunds identify which are insoluble, partially soluble and highly soluble in water?
(i) phenol (ii) toluene (iii) formic acid (iv) ethylene glycol (v) chloroform, (vi) pentanol.

Two liquids A and B boils at 145⁰C and 190⁰C respectively. Which of them has a higher vapour pressure at 80⁰C ?