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13 March, 11:45

Find the mass in grams of hydrogen gas produced when 14.0 moles of HCl is added to an excess amount of magnesium.

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  1. 13 March, 13:10
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    Answer;

    14.0 g of hydrogen gas

    Explanation;

    The equation for the reaction is

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

    From the equation, 2mol HCl will produce 1 mol H2

    Moles of HCl = 14 moles

    Therefore; 14 moles of HCl will produce 7 moles of hydrogen gas

    1 mole of Hydrogen gas = 2.0 g/mol

    Thus; mass of 7.0 moles of H2 = 7 * 2.0 g/mol

    = 14.0 g
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