Chemistry 9th Edition

Published by Cengage Learning
ISBN 10: 1133611095
ISBN 13: 978-1-13361-109-7

Chapter 6 - Thermochemistry - Active Learning Questions - Page 285: 10


If a gas expands, there is an increase in volume and therefore a positive $\Delta V$. However, because the gas is working on the surroundings when expanding into the surroundings, the process results in a loss of energy for the gas. Similarly if a gas contracts, the atmosphere is doing work on the gas, the system, as volume decreases. Therefore, there needs to be a negative sign as the system is the gas.

Work Step by Step

See explanation above.
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