Chemistry 9th Edition

Published by Cengage Learning
ISBN 10: 1133611095
ISBN 13: 978-1-13361-109-7

Chapter 2 - Atoms, Molecules, and Ions - Exercises: 41

Answer

Mass is conserved, as the number and type of atoms do not change before and after chemical reactions.

Work Step by Step

In chemical reactions mass is conserved because the number and type of atoms remain same before and after reaction. In the given example, four hydrogen atoms and two oxygen atoms are there before and after reaction, hence mass is conserved.
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