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21 September, 14:50

If 20 grams of zinc reacts with hydrochloric acid, how much zinc chloride is produced?

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  1. 21 September, 15:05
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    Assuming there is excess acid, the equation for the reaction is Zn + 2HCl - > ZnCl2 + H2.

    Mols of zinc = 20/65 (mass/relative atomic mass)

    Ratio of Zn : ZnCl2 = 1 : 1

    Hence mols of Zinc = mols of Zinc chloride

    Mass of ZnCl2 = (20/65) (65+71)

    = 41.8g
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