Chemistry: The Central Science (13th Edition)

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

Chapter 1 - Introduction: Matter and Measurement - Additional Exercises - Page 38: 1.79a


Peat moss: $0.132g/cm^3$ Topsoil: $2.522g/cm^3$ No, it would not be correct to say that peat moss is "lighter" than the topsoil because they have the same weight, 40lbs.

Work Step by Step

Peat moss: $40lb \times \frac{453.5g}{1lb} \times \frac{1}{14in\times20in\times30in}\times \frac{1in^3}{16.39 cm^3}=0.132g/cm^3$ Topsoil: $40lb \times \frac{453.5g}{1lb} \times \frac{1}{1.9gal}\times \frac{1gal}{3785.4 cm^3}=2.522g/cm^3$ The term "lighter" refers to the objects weights, not their densities. Thus, because both the peat moss and topsoil weigh 40 lbs, neither one is lighter.
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