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Calculate 

(a) molality 

(b) molarity and

 (c) mole fraction of KI if the density of 20% (mass/mass) aqueous KI is 1.202 g mL-1

1 Answer

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(a) Molar mass of KI = 39 + 127 = 166 g mol−1 

20% (mass/mass) aqueous solution of KI means 20 g of KI is present in 100 g of solution.

That is, 20 g of KI is present in (100 − 20) g of water = 80 g of water 

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