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2 November, 00:50

How much chalcopyrite had to be mined to produce 100 pennies if reaction 1 had a percent yield of 63.00 % and all other reaction steps had yield of 100%?

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  1. 2 November, 01:10
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    1) Balanced chemical reaction 1:

    2CuFeS₂ + 3O₂ → 2CuS + 2FeO + 2SO₂.

    Balanced chemical reaction 2: 2FeO + SiO₂ → 2FeSiO₃.

    Balanced chemical reaction 3: 2CuS → Cu₂S + S.

    Balanced chemical reaction 4: Cu₂S + S + O₂ → 2Cu + 2SO₂.

    m (Cu) = 3.0 g; mass of copper in one penny.

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

    n (Cu) = 3 g : 63.55 g/mol.

    n (Cu) = 0.047 mol; amount of copper in one penny.

    2) From balanced chemical reactions: n (Cu) : n (CuFeS₂) = 1 : 1.

    n (CuFeS₂) = 0.047 mol.

    ω (CuFeS₂) = 63.00% : 100%.

    ω (CuFeS₂) = 0.630; a percent yield of chemical reaction 1.

    m (CuFeS₂) = 0.047 mol · 183.54 g/mol : 0.630.

    m (CuFeS₂) = 13.692 g; mass of chalcopyrite for one penny.

    m (CuFeS₂) = 13.6927 g · 100.

    m (CuFeS₂) = 1369.27 g; mass of chalcopyrite for 100 pennies.
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