Question

1. al(oh)₃

element | # of atoms

total |

Explanation:

Step1: Analyze Al atoms

In $\text{Al(OH)}_3$, the coefficient for Al is 1, so number of Al atoms is 1.

Step2: Analyze O atoms

The subscript for (OH) is 3, and each OH has 1 O atom. So number of O atoms is $3\times1 = 3$.

Step3: Analyze H atoms

Each OH has 1 H atom, and there are 3 OH groups. So number of H atoms is $3\times1 = 3$.

Step4: Calculate total atoms

Sum the number of each atom: $1 + 3 + 3 = 7$.

Answer:

Element	# of Atoms
O	3
H	3
Total	7