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Q.

A solution contains 40 g of common salt in 320 g of water. Calculate the concentration in terms of mass by mass percentage of the solution.

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a

12.5%

b

11.5%

c

11.1%

d

13.5%

answer is C.

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Detailed Solution

Given:  Mass of solute = 40g

               Mass of solute= 320g

Mass of solution   =  Mass of solute + Mass of solvent

                                  =40 +320

                                  =360g

Mass by mass percentage of solution =Mass of soluteMass of solution × 100

                                                                           = 40360× 100   

                                                                           =1009

                                                                           = 11.1%

The mass by mass percentage of the given solution is 11.1%   

 

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