## Conceptual Physics (12th Edition)

Published by Addison-Wesley

# Chapter 11 - Think and Discuss: 69

HO.

#### Work Step by Step

To explain the 1:8 mass ratio, early investigators assumed one hydrogen atom to one oxygen atom, HO. We now know that an oxygen atom is about 16 times as massive as hydrogen, and that water molecules are $H_{2}O$. This explains why hydrogen and oxygen react in a 2:16 = 1:8 mass ratio.

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