Calculate the amount of water (in grams) that must be added to each of the following...

Question

Question

Calculate the amount of water (in grams) that must be added to each of the following substances to produce the indicated solution

20.7 g of MgCl2 in the preparation of a 6.2% mass solution

Answer 1

Answer #1

The mass of MgCl2 in the solution should be 6.2% of total mass of the solution. Let the mass of water added be x grams

20.7/(20.7+x) *100 = 6.2

(20.7 +x) = 20.7/6.2 *100

20.7 + x = 333.87

x = 333.87-20.7 = 313.17 g

Answer: 313.17 g

Answer 2

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