Answer:
9
Step-by-step explanation:
The formula Ai2(CO3)3 represents two atoms of the element Ai, three carbonate groups, and a total of nine oxygen atoms.
Let's break it down step by step:
1. The subscript "2" after Ai indicates that there are two atoms of Ai in the formula.
2. The carbonate group, CO3, consists of one carbon atom (C) and three oxygen atoms (O).
3. Since there are three carbonate groups in the formula, we need to multiply the number of oxygen atoms in each carbonate group by three.
- In each carbonate group, there are three oxygen atoms (O) because the subscript "3" after CO3 indicates that there are three oxygen atoms in each carbonate group.
- Therefore, we multiply three oxygen atoms by three carbonate groups, resulting in a total of nine oxygen atoms in the formula Ai2(CO3)3.
To summarize, there are nine oxygen atoms in the formula Ai2(CO3)3.