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  3. Chemistry
  4. Zinc sulphate 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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Q. Zinc sulphate 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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Solution:

$100\, g \,of\, ZnSO_4$ crystals are obtained from $= 22.65\, g\, Zn$
$1 \,g \,of\, ZnSO_4$ crystals will be obtained from $=\frac{22.65}{100}g Zn$
$20 \,g\, of\, ZnSO_4$ crystals obtained from $=\frac{22.65}{100}\times20=4.53g$