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)

8

5

4

2

Explanation:

Step1: Analyze the chemical reaction equation

According to the law of conservation of mass, in a chemical reaction, atoms are neither created nor destroyed. The number of atoms of each element before and after the reaction remains the same.

Step2: Count hydrogen atoms after reaction

In the product \(2H_{2}O\), each \(H_{2}O\) molecule has 2 hydrogen atoms. So for \(2H_{2}O\), the number of hydrogen atoms is \(2\times2 = 4\).

Answer:

4