Question

How many moles of oxygen atoms are present in one mole of the following compounds ?

1. Al₂O₃
2. CO₂
3. Cl₂O₇
4. H₂SO₄
5. Al₂(SO₄)₃

Answer 1

Number of moles of oxygen in the listed compounds are as follows:

• Al₂O₃:  3 moles of oxygen are present in 1 mole of Al₂O₃.
• CO₂:  2 moles of oxygen are present in 1 mole of CO₂.
• Cl₂O₇: 7 moles of oxygen are present in 1 mole of Cl₂O₇.
• H₂SO₄:  4 moles of oxygen are present in 1 mole of H₂SO₄.
• Al₂(SO₄)₃: 12 moles of oxygen are present in 1 mole of Al₂(SO₄)₃ (4 × 3 moles).