CuSO4 mixture

How many grams of solid CuSO4 do we have to add to 450g of 15% CuSO4 solution to produce a 25% solution?

Correct answer:

x =  60 g

Step-by-step explanation:

x+0.15 450=0.25 (x+450)  0.75x=45  x=0.7545=60  x=60=60 g

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