Question

Use the chemical reaction to answer the question.

2H2+O2→2H2O
2
H
2
+
O
2
→
2
H
2
O

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

(1 point)
Responses

8
8

2
2

5
5

4

Answer 1

In the given chemical reaction:

\[ 2H_2 + O_2 → 2H_2O \]

There are 4 atoms of hydrogen on the reactant side (since each \( H_2 \) molecule has 2 hydrogen atoms and there are 2 \( H_2 \) molecules: \( 2 \times 2 = 4 \) H).

On the product side, the reaction produces \( 2H_2O \), where each \( H_2O \) molecule contains 2 hydrogen atoms. Since there are 2 \( H_2O \) molecules, the total number of hydrogen atoms is:

\[ 2 \times 2 = 4 \]

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

The correct response is:

4