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

4
4

2
2

8

Answer 1

In the given reaction, 2H₂ + O₂ → 2H₂O, we see that:

• Before the reaction, there are 2 molecules of H₂, which means there are 2 x 2 = 4 atoms of hydrogen (H).
• After the reaction, there are 2 molecules of H₂O formed, which also means there are 2 x 2 = 4 atoms of hydrogen (H) in the water.

So, the number of hydrogen atoms present after the reaction is 4.

The correct response is 4.