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13 March, 06:29

A student performs an experiment to determine the volume of hydrogen gas produced when a given mass of magnesium reacts with excess HCl (aq), as represented by the net ionic equation above. The student begins with a 0.0360 g sample of pure magnesium and a solution of 2.0 M HCl (aq).

(a) Calculate the number of moles of magnesium in the 0.0360 g sample

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  1. 13 March, 06:38
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    1.48x10⁻³ mol

    Explanation:

    The balanced equation is

    Mg (s) + 2HCl (aq) → MgCl₂ (aq) + H₂ (g)

    The aqueous solution will disociate, so:

    Mg (s) + 2H⁺ (aq) + 2Cl⁻ (aq) → Mg²⁺ (aq) + 2Cl⁻ (aq) + H₂ (g)

    Simplifying by eliminating the bolded substances that have the same amount in both sides, we have the net ionic equation:

    Mg (s) + 2H⁺ (aq) → Mg²⁺ (aq) + H₂ (g).

    a) The number of moles of Magnesium is the mass divided by the molar mass (24.305 g/mol):

    n = 0.0360/24.305

    n = 1.48x10⁻³ mol
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