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Zinc sulphate contains 22.65% of zinc and 43.9% of water of crystallization.If the law of contant proportion is true,then weight of zinc required to produce 20g of hte crystals will be?
From 100 g compound we have 22.65 gm of Zn then,1 g of compound would have => 22.65/100 Zn => 0.2265 gm.Hence for 40 g compound it would be => 0.2265 x 20 = > 4.5 gms approx.
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