Question

1. write a chemical formula that shows 3 molecules of water:

Explanation:

Step1: Recall water formula

The chemical formula for one - molecule of water is $H_2O$.

Step2: Indicate 3 molecules

To show 3 molecules of water, we use the coefficient 3 in front of the formula. So the formula is $3H_2O$.

Answer:

$3H_2O$