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28 April, 12:42

If 1g of Ba reacts with 1.8g Al (SO4) 3, what is the excess reactant

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  1. 28 April, 14:24
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    Al₂ (SO₄) ₃ is the excess reactant.

    Explanation:

    Barium (Ba) react with Aluminium sulphate [Al₂ (SO₄) ₃] according to the following balanced equation:

    3 Ba + Al₂ (SO₄) ₃ → 3 BaSO₄ + 2 Al

    It is clear that 3 mol of Ba react with 1 mol of Al₂ (SO₄) ₃ to give 3 moles of BaSO₄

    The limiting reactant is the reactant that produces the least amount of BaSO ₄.

    The molar masses of each substance involved.

    Ba : 137.3 g/mol

    Al₂ (SO₄) ₃: 342.1 g/mol

    BaSO ₄: 233.3 g/mol

    Then we calculate no of moles of each reactant from the given mass.

    As following:

    no. of moles of Ba = (mass / molar mass) = (1 g / 137.3 g/mol) = 0.0073 mol

    no. of moles of Al₂ (SO₄) ₃ = (mass / molar mass)

    = (1.8 g / 342.1 g/mol) = 0.0053 mol

    Then we calculate mol of product produced from each reactant

    For BaSO₄

    3 mol of BaSO₄ produced from → 3 mol of Ba? mol of BaSO₄ produced from → 0.0073 mol of Ba

    no of moles of BaSO₄ from Ba = (0.0073 * 3) / 3 = 0.0073 mol

    then converting moles of BaSO₄ into mass

    mass of BaSO₄ = no of moles * molar mass = 0.0073 * 233.3 = 1.7 g

    For Al₂ (SO₄) ₃

    3 mol of BaSO₄ produced from → 1 mol of Al₂ (SO₄) ₃? mol of BaSO₄ produced from → 0.0053 mol of Al₂ (SO₄) ₃

    no of moles of BaSO₄ from Al₂ (SO₄) ₃ = (0.0053 * 3) / 1 = 0.0159 mol

    then converting moles of BaSO₄ into mass

    mass of BaSO₄ = no of moles * molar mass = 0.0159 * 233.3 = 3.7 g

    ∴1 g of Ba produces the least amount of barium sulfate, so it is the limiting reactant and Al₂ (SO₄) ₃ is the excess reactant.
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