is 2 NO2(g)   → N2O4(g) + 19 kcal a exothermic or endothermic

Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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is 2 NO2(g)   → N2O4(g) + 19 kcal a exothermic or endothermic

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What is endothermic and exothermic reactions?

In simple words, 

Endothermic reaction - when heat is absorbed , the reaction is endothermic.

Exothermic reaction - when heat is released, the reaction is exothermic. 

When the strength of new bond in product is greater than old bond which is broken, the heat releases and so the reaction is exothermic. 

When new bond is weaker than old bond heat is absorbed and the reaction is known as enothermic.

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