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Silver is removed from the solutions of ...

Silver is removed from the solutions of its salts with metallic zinc, according to the reaction
`Zn + 2 Ag^(o+) rarr Zn^(2+) + 2Ag`.
A `65.4 g` piece of `Zn` is put into a `100 L` vat containing `3.25 g` `Ag^(o+)` per litre. How amny moles of reactant remained unreacted?

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