how many hydrogen are in 4h₂o?

Explanation:

Step1: Analyze the formula of one (H_2O) molecule

In one (H_2O) molecule, the sub - script of (H) is (2), which means there are (2) hydrogen atoms in one (H_2O) molecule.

Step2: Calculate the number of hydrogen atoms in (4H_2O)

We have (4) (H_2O) molecules. Using the formula (n = 4\times2) (where (n) is the total number of hydrogen atoms).

Answer:

(8)