MCQ
Mole Concept
By Sakshi Goel | 19 May'20 | 592 Views
MCQ
Problem:
Solution:
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The density of a solution of 3.69 g KI in 21.70 g H2O is 1.11 g/mL. Calculate the % w/v of KI in the solution.
(a) 14.5 % (w/v)
(b) 16.1 % (w/v)
(c) 18.9 % (w/v)
(d) 20.8 % (w/v)
Solution:
Mass of KI = 3.69 g
Mass of water = 21.70 g
Total mass of solution = 3.69+21.70 = 25.39 g
Density of solution = 1.11 g/ml
Total volume of solution = mass of solution/density = 25.39/1.11 = 22.87 ml
So, 22.87 ml of solution contains 3.69 g of KI
100 ml of solution will contain mass of KI = 3.69 x 100/22.87 = 16.13 g
So, % w/v of KI is 16.1 % (w/v)
Option (b) is correct.
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