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

4
4

8
8

2
2

5

Answer 1

In the chemical reaction \( 2H_2 + O_2 → 2H_2O \), there are four atoms of hydrogen (\(2H_2\) consists of 2 molecules of diatomic hydrogen, each containing 2 hydrogen atoms, totaling 4 hydrogen atoms).

After the reaction, \(2H_2O\) is formed, which contains 2 molecules of water. Each water molecule contains 2 hydrogen atoms:

- \(2H_2O\) therefore contains \(2 \times 2 = 4\) hydrogen atoms.

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

The correct response is: **4**.