Chemistry: Principles and Practice (3rd Edition)

Published by Cengage Learning
ISBN 10: 0534420125
ISBN 13: 978-0-53442-012-3

Chapter 2 - Atoms, Molecules, and Ions - Questions and Exercises - Exercises - Page 85: 2.70

Answer

(a) C$_2$H$_2$ (b) PCl$_3$

Work Step by Step

(a) There are two carbon atoms bonded to two hydrogen atoms. In hydrocarbons, the carbon atom is written first. Therefore, we have C$_2$H$_2$. (b) We have one phosphorus atom bonded to three chlorine atoms. The more electronegative element is written second. Therefore, we have PCl$_3$.
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