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

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45.3 g

0.453 g

4.53 g

453 g

answer is C.

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Detailed Solution

100 g of ZnSO₄ crystals are obtained from = 22.65 g Zn

1 g of ZnSO₄ crystals will be obtained from $= \frac{22 .65}{100} g Zn$

20 g of ZnSO₄ crystals obtained from $= \frac{22.65}{100} \times 20 = 4.53 g$

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