2. Oxygen Oxygen 2O
3. Carbon dioxide Carbon, Oxygen 1C, 2O
4. Nitrogen, Hydrogen 1N, 3H
5. Sulfur, Oxygen
6. N2: Nitrogen Nitrogen
7. HCl: Hydrogen, Chlorine 1H, 1Cl
8. H2SO4: Hydrogen, Sulfur, Oxygen 2H, 1S, 4O
9. Carbon, Hydrogen 1C, 4H
10. Hydrogen Hydrogen 2H
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