Question

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?

Answer 1

0.555 grams of Cu will be produced

Step-by-step 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

Answer 2

0.55 g of Cu can produced by this decomposition

Step-by-step 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