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20 April, 11:10

When copper reacts with silver nitrate according to the equation, the number of grams of copper required to produce 432 grams of silver is - ?

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  1. 20 April, 11:27
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    Answer is: mass of copper is 127 grams.

    Balanced chemical reaction: Cu (s) + 2AgNO₃ (aq) → Cu (NO₃) ₂ (aq) + 2Ag (s).

    m (Ag) = 432 g.

    n (Ag) = m (Ag) : M (Ag).

    n (Ag) = 432 g : 108 g/mol.

    n (Ag) = 4 mol.

    From chemical reaction: n (Ag) : n (Cu) = 2 : 1.

    n (Cu) = 4 mol : 2 = 2 mol.

    m (Cu) = n (Cu) · M (Cu).

    m (Cu) = 2 mol · 63.5 g/mol.

    m (Cu) = 127 g.
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