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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Chemistry

Dennis

1 July, 20:47

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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Galvan · Answer 1

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.