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)
○ 2
○ 4
○ 5
○ 8

Explanation:

Step1: Analyze the chemical reaction equation

According to the law of conservation of mass, atoms are neither created nor destroyed in a chemical reaction.

Step2: Count hydrogen atoms in the product

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