What is the enthalpy of reaction (ΔHrxn)? Why is this quantity important?
Step 1 of 3
Enthalpy of reaction is defined as the amount of heat absorbed or evolved in
the reaction under constant pressure.
Enthalpy of a reaction is important because, it gives the information about the system and surroundings.
- Most reactions occur under constant pressure conditions.
Many reactions do not involve gaseous reactants or products.thus very little work associated with the reaction E ~ H.
Since, the enthalpy is equal to the heat transfer at constant pressure, so we can determine the nature of a reaction from the sign of H:
Exothermic Reaction H < 0 (negative) and the reaction gives off heat
Endothermic Reaction H > O (positive) and the reaction absorbs heat
Textbook: Introductory Chemistry
Author: Nivaldo J Tro
This textbook survival guide was created for the textbook: Introductory Chemistry, edition: 5. This full solution covers the following key subjects: Enthalpy, important, quantity, reaction, Rxn. This expansive textbook survival guide covers 19 chapters, and 2046 solutions. The answer to “What is the enthalpy of reaction (?Hrxn)? Why is this quantity important?” is broken down into a number of easy to follow steps, and 12 words. The full step-by-step solution to problem: 13Q from chapter: 8 was answered by , our top Chemistry solution expert on 05/06/17, 06:45PM. Since the solution to 13Q from 8 chapter was answered, more than 927 students have viewed the full step-by-step answer. Introductory Chemistry was written by and is associated to the ISBN: 9780321910295.