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.
![A sample of 48.6 g of water was placed in a calorimeter, and the temperature of that water sample was measured to be 24.1 °C. When 1.57 g of solid NaOH was dissolved in that water, the temperature of the solution increased to 35.6 °C.
Which one of the following statements is true?
- a. The temperature of the solution increases from 24.1 °C to 35.6 °C; therefore, the dissolution process is exothermic. ✔
- b. The temperature of the solution increases from 24.1 °C to 35.6 °C; therefore, the dissolution process is endothermic.
- c. The dissolution process is endothermic because there are 48.6 g of water and only 1.57 g of NaOH.
- d. The dissolution process is exothermic because there are 48.6 g of water and only 1.57 g of NaOH.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F76884ef0-0050-4a4d-a83f-5c6d84fc3fcd%2Fc90b3a62-1ea2-498b-b9f8-d87aa734e185%2Few3qb8_processed.jpeg&w=3840&q=75)
![**Problem Statement:**
Calculate \( \Delta H_{\text{dissolution}} \), the enthalpy for the dissolution process in water, per mole of NaOH.
**Input Fields:**
- **Answer:** [ _______ ] J/mol
**Actions:**
- **Check:** [Button]
This exercise requires you to determine the enthalpy change when NaOH dissolves in water, expressed in Joules per mole. Enter your calculated value in the provided answer box and click “Check” to verify your answer.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F76884ef0-0050-4a4d-a83f-5c6d84fc3fcd%2Fc90b3a62-1ea2-498b-b9f8-d87aa734e185%2Fhfp9t6a_processed.jpeg&w=3840&q=75)
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