What is the enthalpy of reaction (?Hrxn)? Why is this quantity important?

Introductory Chemistry | 5th Edition | ISBN: 9780321910295 | Authors: Nivaldo J Tro

ISBN: 9780321910295 34

Solution for problem 13Q Chapter 8

Introductory Chemistry | 5th Edition

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Problem 13Q

PROBLEM 13Q

What is the enthalpy of reaction (ΔHrxn)? Why is this quantity important?

Step-by-Step Solution:

Step 1 of 3

Solution 13Q

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

Step 2 of 3

Chapter 8, Problem 13Q is Solved

Step 3 of 3

Textbook: Introductory Chemistry

Edition: 5

Author: Nivaldo J Tro

ISBN: 9780321910295

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.