Use the chemical reaction to answer the question.

Question

2H2+O2→2H2O

There are four atoms of hydrogen ( H
) before the reaction. How many atoms of hydrogen are present after the reaction?

(1 point)
Responses

5
5

2
2

4

8

Answer 1

In the chemical reaction \( 2H_2 + O_2 → 2H_2O \), there are 4 atoms of hydrogen (H) on the left side of the equation (2 molecules of \( H_2 \), each containing 2 hydrogen atoms).

After the reaction, we also have 2 molecules of water (\( H_2O \)) on the right side of the equation. Each water molecule contains 2 hydrogen atoms, so:

\[ 2 \text{ molecules of } H_2O \times 2 \text{ hydrogen atoms/molecule} = 4 \text{ hydrogen atoms} \]

Therefore, there are 4 atoms of hydrogen present after the reaction.

The correct response is 4.