Answer:
1. Calcium oxide contains 1 calcium and one oxygen.
2. Hydrogen peroxide contains 2 hydrogens and 2 oxygens.
3. Methane contains 1 carbon and 4 hydrogens.
4. Ammonia contains 1 nitrogen and 3 hydrogens.
5. Ammonium carbonate contains 2 nitrogens, 8 hydrogens, 1 carbon, and 3 oxygens.
6. Aluminum sulfate contains 3 sulfates and 12 oxygens.