Which of the following must be the same before and after a chemical reaction? A. The sum of the masses of all substances involved. B. The number of molecules of all substances involved. C. The number of atoms of each type involved. D. Both a) and c) must be the same. E. Each of the answers a) b) and c) must be the same.

Which of the following must be the same before and after a chemical reaction? A. The sum of the masses of all substances involved. B. The number of molecules of all substances involved. C. The number of atoms of each type involved. D. Both a) and c) must be the same. E. Each of the answers a) b) and c) must be the same.

World of Chemistry

7th Edition

ISBN:9780618562763

Author:Steven S. Zumdahl

Publisher:Steven S. Zumdahl

Chapter9: Chemical Quantities

Section: Chapter Questions

Problem 63A

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