Question

6.) determine the number of atoms in each formula: al₂(so₄)₃ (3 points) al s o 8 3 1 5 12 4 2 7 6

Explanation:

Step1: Determine number of Al atoms

The sub - script of Al is 2, so there are 2 Al atoms.

Step2: Determine number of S atoms

The formula has 3 sulfate ($SO_4$) groups. The sub - script of S within each $SO_4$ is 1. So the number of S atoms is $1\times3 = 3$.

Step3: Determine number of O atoms

Each $SO_4$ group has 4 O atoms, and there are 3 sulfate groups. So the number of O atoms is $4\times3=12$.

Answer:

Al: 2
S: 3
O: 12