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10 October, 23:57

Copper (II) oxide can be heated until it decomposes into elemental copper and oxygen gas. Is 0.695 grams of Copper (II) oxide is produced from a Copper (II) compound, how many grams of elemental Cu could be produced in the decomposition of CuO?

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  1. 11 October, 01:37
    0
    0.555 grams of Cu will be produced

    Explanation:

    Step 1: Data given

    Mass of copper (II) oxide = 0.695 grams

    Molar mass Copper (II) oxide = 79.545 g/mol

    Step 2: The balanced equation

    2CuO → 2Cu + O2

    Step 3: Calculate moles CuO

    Moles CuO = mass CuO / molar mass CuO

    Moles CuO = 0.695 grams / 79.545 g/mol

    Moles CuO = 0.00874 moles

    Step 4: Calculate moles Cu

    For 2 moles CuO we'll have 2 moles Cu and 1 mol O2

    For 0.00874 moles CuO we'll have 0.00874 moles

    Step 5: Calculate mass Cu

    Mass Cu = 0.00874 moles * 63.546 g/mol

    Mass Cu = 0.555 grams

    0.555 grams of Cu will be produced
  2. 11 October, 02:49
    0
    0.55 g of Cu can produced by this decomposition

    Explanation:

    Let's think the reaction of decomposition:

    2CuO → 2Cu + O₂

    Ratio is 2:2. 2 moles of CuO can decompose into 2 moles of Cu and 1 mol of oxygen.

    Let's convert the mass of oxyde to moles → 0.695 g. 1 mol / 79.55 g =

    8.74*10⁻³ moles

    8.74*10⁻³ mol of CuO decompose to 8.74*10⁻³ moles of Cu

    Let's find out the mass → 8.74*10⁻³ mol. 63.55 g/1mol = 0.55 g
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