Question

2/10
how many oxygen atoms are in $ce{al_{2}(so_{4})_{3}}$?

1. 12
2. 7
3. 4
4. 24

Explanation:

Step1: Identify O count in sulfate

In $\text{SO}_4$, oxygen atoms = 4

Step2: Multiply by subscript outside parentheses

Total O atoms = $4 \times 3 = 12$

Answer:

1. 12