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

2
2

8
8

4
4

5

Answer 1

In the given chemical reaction \(2H_2 + O_2 \rightarrow 2H_2O\), the reactants consist of 4 hydrogen atoms (from \(2H_2\), which has 2 molecules each containing 2 hydrogen atoms).

On the product side, \(2H_2O\) represents 2 water molecules, each containing 2 hydrogen atoms as well. Therefore, there are also 4 hydrogen atoms in the products (2 water molecules × 2 hydrogen atoms per water molecule = 4 hydrogen atoms).

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

The correct response is: **4**.