Zinc (AW=65.5) reacts with dilute HCl to liberate H 2 gas whereas Cu (AW=63.5) does not. A
4.5 grams sample of an alloy of Zn and Cu produced 683.2cc of H 2 gas at STP on treatment with
dilute HCl. Calculate the percentage composition of the alloy.
Zn + 2HCl ZnCl 2 + H
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what is this chemistry formula
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