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02/10/2020 11:16 am
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A solution containing 10g per dm3 of urea (molecular mass = 60 g mol-1) is isotonic with a 5% solution of a non-volatile solute. The molecular mass of this non volatile solute is
(a) 300 g mol-1
(b) 350 g mol-1
(c) 200 g mol-1
(d) 250 g mol-1
1 Answer
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02/10/2020 11:19 am
(a) 300 g mol-1
Explanation:
Molar concentration of urea = 10/60 per dm3
Molar concentration of volatile solute solution
= 5/M per 100 ml. or, 50/M per dm3
For solution of same concentration
or, isotonic solution at same temperature
10/60 = 50/M or, M = 300 g mol-1