Chemistry 9th Edition

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

Chapter 6 - Thermochemistry - Questions - Page 285: 13


q is negative. w is negative.

Work Step by Step

The combustion of $C_8H_{18}$ is an exothermic reaction as the combustion releases energy. Therefore q is negative. Also, because we are changing from one mole of liquid to two moles of gas, the reaction involves the expansion of gas and thus doing work on the surroundings. Therefore, w is negative as well.
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