The specific heat of water is 4.18 J/g-K. AHsolution When a 9.15-g sample of gaseous hydrogen bromide dissolves in 55.7 g of water in a coffee-cup calorimeter (see above figure) the temperature rises from 20.00 °C to 55.34 °C. Calculate AH in kJ/mol HBr for the solution process. HBr(g) → H+ (aq) + Brū(aq) = thermometer kJ/mol HBr. stirrer coffee cups containing reaction mixture
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.
![### Calorimetry Experiment: Dissolution of Gaseous Hydrogen Bromide
#### Experimental Setup
- **Components**: The experiment utilizes a simple coffee-cup calorimeter consisting of two nested coffee cups containing the reaction mixture. A thermometer and a stirrer are inserted through the top. The purpose is to measure temperature changes during a chemical reaction.
#### Procedure
- A **9.15-g sample** of **gaseous hydrogen bromide (HBr)** dissolves in **55.7 g of water** within the coffee-cup calorimeter.
#### Observations
- The **initial temperature** of the reaction mixture is **20.00°C**.
- The **final temperature** rises to **55.34°C**.
#### Reaction
- The chemical reaction occurring is:
\[
\text{HBr(g)} \rightarrow \text{H}^+(\text{aq}) + \text{Br}^-(\text{aq})
\]
#### Calculations
- Calculate the change in enthalpy (\(\Delta H\)) for the solution process in kJ/mol HBr.
#### Data
- **Specific heat of water**: \(4.18 \, \text{J/g} \cdot \text{K}\)
#### Formula
- Use the provided formula to calculate \(\Delta H_{\text{solution}}\):
\[
\Delta H_{\text{solution}} = \text{______} \, \text{kJ/mol HBr}
\]
This content will help in understanding the calorimetry process and its application in measuring enthalpy changes during the dissolution of gaseous hydrogen bromide.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F86624ab7-da2a-4a5b-91b8-0bf4ad8ab366%2F63df5d0f-38cc-4a69-a211-9dfc3abafc5c%2Ff9d9ml_processed.png&w=3840&q=75)
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