Answer:
Explanation:
D I think I am dumb
sorry
1. 4NHCO3
2. 3CaCO3
3. 5NaC2H3O
4. 6NH3
5. 2CaCl2O2
ans ( a). NHCO3
combination of a very light gas (hydrogen) and a substance that is found in all living things (carbon). Hydrocarbons are found in petrol, coal and natural gas