Question

Q-17 (a) Define the following terms:
(i) Molarity
(i) Molal elevation constant (K)
(b) A solution containing 15 g urea (molar mass - 60 g mol-) per litre of solution in
water has the same osmotic pressure (isotonic) as a solution of glucose (molar mass -
180 g mol-') in water. Calculate the mass of glucose present in one litre of its solution.​

Answer 1

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Answer:

(a)

(i) Molarity of a solution is defined as the number of moles of solute present in one litre of the solvent.

(ii) Molal elevation constant (K

b

) is defined as the elevation in boiling point of a solution when one mole of a non volatile solute is dissolved in one kilogram of a volatile solvent.

(b) Osmotic pressure π=CRT

when n is the number of moles of solute present in volume V of solvent

It is given that the solution of urea is isotonic with the solution of glucose, thus

V

n

Glucose

RT=

V

n

Urea

RT

=Glucose =

60

15

×180=45g

Hence, the mass of glucose present in one litre of its solution = 45g

Explanation:

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