Question

question 4 of 10
al₂(so₄)₃
how many total atoms are in al₂(so₄)₃?
12
3
17
24

Explanation:

Step1: Count aluminum atoms

There are 2 aluminum (Al) atoms as indicated by the sub - script 2.

Step2: Count sulfur atoms

The sub - script 3 outside the sulfate group $SO_4$ means there are 3 sulfur (S) atoms since there is 1 sulfur atom in each $SO_4$ group.

Step3: Count oxygen atoms

There are 4 oxygen (O) atoms in each $SO_4$ group, and with 3 $SO_4$ groups, there are $4\times3 = 12$ oxygen atoms.

Step4: Calculate total atoms

Add the number of Al, S, and O atoms: $2+3 + 12=17$.

Answer:

17