Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
![**Title: Calculating Standard Enthalpy Change**
**Introduction:**
In this section, we'll learn how to calculate the standard enthalpy change for a chemical reaction using standard heats of formation.
**Reaction:**
\[ \text{N}_2(g) + \text{O}_2(g) \rightarrow 2\text{NO}(g) \]
**Objective:**
Calculate the standard enthalpy change for the reaction above.
**Answer:**
\[ \text{ANSWER:} \ \underline{\hspace{50px}} \ \text{kJ} \]
**Instructions:**
1. Identify the standard heat of formation (\( \Delta H_f^\circ \)) for each substance from a reliable source.
2. Use the formula for calculating the standard enthalpy change (\( \Delta H^\circ \)) of the reaction:
\[ \Delta H^\circ = \sum (\Delta H_f^\circ \text{ of products}) - \sum (\Delta H_f^\circ \text{ of reactants}) \]
3. Insert the values into the formula and solve for \( \Delta H^\circ \).
This exercise will help you understand the process of calculating energy changes in chemical reactions, an essential concept in thermochemistry.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fde61c37a-4bdc-4c62-ae9e-037cabbf2ff6%2Fd31f7100-76f0-4ba8-8ddd-8a9b94f2f11e%2Fbdlu2ja_processed.png&w=3840&q=75)
Step by step
Solved in 2 steps with 2 images
