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3 November, 08:13

If all of the chloride in a 3.734-g sample of an unknown metal chloride is precipitated as agcl with 70.90 ml of 0.2010 m agno3, what is the percentage of chloride in the sample?

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  1. 3 November, 10:28
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    Answer is: the percentage of chloride in the sample is 13.53%.

    Balanced chemical reaction: MCl + AgNO₃ (aq) → AgCl (s) + MNO₃ (aq).

    V (AgNO₃) = 70.90 mL : 1000 mL.

    V (AgNO₃) = 0.0709 L; volume of silver nitrate.

    c (AgNO₃) = 0.2010 M; molarity of the solution.

    n (AgNO₃) = V (AgNO₃) · c (AgNO₃).

    n (AgNO₃) = 0.0709 L · 0.201 mol/L.

    n (AgNO₃) = 0.0143 mol; amount of silver nitrate.

    From chemical reaction: n (AgNO₃) : n (MCl) = 1 : 1.

    n (MCl) = 0.0143 mol; amount of the sample.

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

    M (MCl) = 3.734 g : 0.0143 mol.

    M (MCl) = 261.11 g/mol; molar mass of the sample.

    ω (Cl) = M (Cl) : M (MCl) · 100%.

    ω (Cl) = 35.45 g/mol : 261.11 g/mol · 100%.

    ω (Cl) = 13.53 %.
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