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Q.

A solution contains 80 g of copper sulphate in 320 g of water. Calculate the concentration in terms of mass by mass percentage of the solution.

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a

12%

b

25%

c

30%

d

20%

answer is A.

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Detailed Solution

Given:  Mass of solute = 80g

               Mass of solute= 320g

Mass of solution   =  Mass of solute + Mass of solvent

                                   =80 +320

                                   = 400 g

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

                                                                            = 80400× 100

                                                                            =1005

                                                                            =20%

The mass by mass percentage of the given solution is 20%

               

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