Q.

Zinc sulphate contains 22.65% zinc and 43.9% water of crystallization. If the law of constant proportions is true then the weight of zinc required to produce 20 g of the zinc sulphate crystals will be

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a

45.3 g

b

4.53 g

c

0.453 g

d

453 g

answer is B.

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Detailed Solution

To prepare 20g zinc sulphate crystals, zinc required=22.65100×20=4.53 g
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Zinc sulphate contains 22.65% zinc and 43.9% water of crystallization. If the law of constant proportions is true then the weight of zinc required to produce 20 g of the zinc sulphate crystals will be