Chemistry: The Central Science (13th Edition)

Published by Prentice Hall
ISBN 10: 0321910419
ISBN 13: 978-0-32191-041-7

Chapter 2 - Atoms, Molecules, and Ions - Exercises - Page 77: 2.81b


Structural formula: Picture attached. Molecular formula: $C_{5}H_{12}$ Empirical formula: $C_{5}H_{12}$

Work Step by Step

In alkane, all the carbon atoms are bonded by hydrogen atoms. In a straight chain alkane with 5 carbon atoms, 12 hydrogen atoms are bonded. Thus, the structutal formula is attached below. To find the molecular formula, we count the total number of each element in a compound. In pentane, 5 carbon atoms are present and 12 hydrogen atoms are present. Therefore, the molecular formula will be $C_{5}H_{12}$ . In order to find the empirical formula we take out the simplest ratio of elements in a compound. $5:12$ cannot be simplified further so the empirical formula of pentane is $C_{5}H_{12}$
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