Educational worksheet for practicing counting atoms in chemical compounds

1. 2 H₂O: 2 molecules × (2 H atoms + 1 O atom) = 4 H atoms, 2 O atoms
2. 3 CO₂: 3 molecules × (1 C atom + 2 O atoms) = 3 C atoms, 6 O atoms
3. 4 NH₃: 4 molecules × (1 N atom + 3 H atoms) = 4 N atoms, 12 H atoms
4. 5 H₂SO₄: 5 molecules × (2 H atoms + 1 S atom + 4 O atoms) = 10 H atoms, 5 S atoms, 20 O atoms
5. 2 MgCl₂: 2 molecules × (1 Mg atom + 2 Cl atoms) = 2 Mg atoms, 4 Cl atoms
6. 3 Fe₂O₃: 3 molecules × (2 Fe atoms + 3 O atoms) = 6 Fe atoms, 9 O atoms
7. 4 Na₂CO₃: 4 molecules × (2 Na atoms + 1 C atom + 3 O atoms) = 8 Na atoms, 4 C atoms, 12 O atoms
8. 2 Al(NO₃)₃: 2 molecules × (1 Al atom + 3 N atoms + 9 O atoms) = 2 Al atoms, 6 N atoms, 18 O atoms
9. 5 K₂SO₄: 5 molecules × (2 K atoms + 1 S atom + 4 O atoms) = 10 K atoms, 5 S atoms, 20 O atoms
10. 3 Ca(OH)₂: 3 molecules × (1 Ca atom + 2 O atoms + 2 H atoms) = 3 Ca atoms, 6 O atoms, 6 H atoms