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21 December, 18:59

Today chlorine is prepared from sodium chloride by electrochemical decomposition. Formerly chlorine was produced by heating hydrochloric acid with pyrolusite (manganese (IV) oxide, MnO2), a common manganese ore. Small amounts of chlorine may be prepared in the laboratory by the same reaction: 4HCl (aq) + MnO2 (s) → 2H2O (l) + MnCl2 (aq) + Cl2 (g) How many grams of HCl react with 5.18 g of manganese dioxide, according to this equation?

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  1. 21 December, 19:28
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    Answer: 8.702g of HCl

    Explanation:

    Using the details from the equation;

    4HCl (aq) + MnO2 (s) → 2H2O (l) + MnCl2 (aq) + Cl2 (g)

    The molecular mass of HCl is; 4 (1 + 35.5) = 146g

    The molecular mass of MnO2 is; (54.9 + 32) = 86.9g

    From the equation it means;

    86.9g of MnO2 reacts with 146g of HCl

    if 1 g of MnO2 reacts with 146 : 86.9 of HCl

    ∴ 5.18g of MnO2 will react with; 146 : 86.9 x 5.18 = 8.702g of HCl

    Note: Approximations were made during the determination of the molecular masses.
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