General Chemistry 10th Edition

Published by Cengage Learning
ISBN 10: 1-28505-137-8
ISBN 13: 978-1-28505-137-6

Chapter 6 - Thermochemistry - Questions and Problems - Page 261: 6.53

Answer

Please see the work below.

Work Step by Step

We know that the gain of $66.2KJ$ of heat per 2 mol $NO_2$ means that the reaction is endothermic. As the energy is gained by the system from the surroundings and q is positive and is given as $+66.2KJ$ for 2 mol of $NO_2$ reacting.
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