how many total atoms make up a single water molecule? 2 4 3 1

Answer:

C. 3

Explanation:

Step1: Recall water's chemical formula

The chemical formula of water is $H_2O$.

Step2: Count the atoms

In $H_2O$, there are 2 hydrogen (H) atoms and 1 oxygen (O) atom. So in total, there are $2 + 1=3$ atoms in a single water molecule.