Question

Use the chemical reaction to answer the 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

8
8

2
2

4
4

5
5

Answer 1

In the balanced chemical reaction \( 2H_2 + O_2 \rightarrow 2H_2O \), there are four atoms of hydrogen (H) before the reaction because each \( H_2 \) molecule contains 2 hydrogen atoms, and there are 2 \( H_2 \) molecules (2 x 2 = 4).

After the reaction, the products are \( 2H_2O \). Each water molecule (H2O) contains 2 hydrogen atoms, and there are 2 water molecules produced (2 x 2 = 4).

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

The correct answer is **4**.