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24 June, 12:13

After 5 minutes, 1.98 * 10-3 moles of hydrogen gas is produced. How many grams of magnesium reacted?

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  1. 24 June, 13:26
    0
    0.048 g

    Explanation:

    We are given;

    Moles of hydrogen gas as 1.98 * 10^-3 moles

    We are required to calculate the mass of Magnesium that reacted

    Assuming the equation for the reaction is;

    Mg + 2HCl → MgCl₂ + H₂

    From the reaction;

    1 mole of magnesium reacts with 2 moles of HCl to produce 1 mole of MgCl₂ and 1 mole of hydrogen gas

    Therefore;

    Mole ratio of Mg : H₂ is 1 : 1

    Thus, moles of Mg = Moles of H₂

    Moles of Mg is 1.98 * 10^-3 moles

    But, molar mass of Mg = 24.305 g/mol

    Therefore;

    Mass of Mg = 1.98 * 10^-3 moles * 24.305 g/mol

    = 0.048 g

    The mass of Mg that reacted is 0.048 g
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