7 What is the molarity of a 168 percent by mass aqueous solu

7. What is the molarity of a 16.8 percent by mass aqueous solution of Kl with a density of 1.15 g/ml? 8. What is the osmotic pressure of the solution in Q# 7 at 27 °C? 9. Arrange the following aqueous solutions in order of increasing boiling point, freezing point, A. 0.25 m Ca3(PO4)2 B. 0. 30 m Na3PO4 C. 1.05 m CCI4 D. 0.55 m KNO3

Solution

7-

step1 Mass of 1 litre of solution =1000x1.15= 1150 g

Step2 Mass of KBr = 1150x 16.8/100

Step3 Molarity = Mass of KBr/Molar mass of KBr =1150 x16.8/(100x166.0028) =1.16 M

9.

Calculate the osmotic pressure.

P = iMRT

= 2*1.16*0.08206*(27+273)

= 57.113 atm

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