Measurements show that the enthalpy of a mixture of gaseous reactants decreases by 236. kJ during a certain chemical reaction, which is carried out at a constant pressure. Furthermore, by carefully monitoring the volume change it is determined that -114. kJ of work is done on the mixture during the reaction. Calculate the change in energy of the gas mixture during the reaction. Be sure your answer has the correct number of significant digits. Is the reaction exothermic or endothermic? O exothermic O endothermic X 3
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.
![**Educational Website Content:**
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**Topic: Change in Enthalpy and Work in Chemical Reactions**
Measurements show that the enthalpy of a mixture of gaseous reactants decreases by 236 kJ during a certain chemical reaction, which is carried out at a constant pressure. Furthermore, by carefully monitoring the volume change, it is determined that -114 kJ of work is done on the mixture during the reaction.
**Problem:**
1. **Calculate the change in energy of the gas mixture during the reaction.**
Be sure your answer has the correct number of significant digits.
- **Energy Change (kJ):** [Input Box]
2. **Is the reaction exothermic or endothermic?**
- [ ] exothermic
- [ ] endothermic
**Explanation:**
Use the following formula to calculate the change in energy (\(\Delta E\)):
\[
\Delta E = \Delta H + \text{Work}
\]
Where:
- \(\Delta H\) is the change in enthalpy,
- Work is the work done on the system.
In this problem, \(\Delta H = -236 \text{ kJ}\) and Work = \(-114 \text{ kJ}\).
**Buttons:**
- **[Explanation]** - Click for a detailed explanation of the solution.
- **[Check]** - Click to check your answer.
Note: [Image of input field and checkboxes]
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**Additional Information:**
This exercise helps understand the concepts of energy changes in thermodynamics, demonstrating how work and enthalpy changes contribute to the overall energy change in chemical processes. Recognizing whether the reaction is exothermic or endothermic provides insights into the energy flow.
For further learning, explore topics on enthalpy, energy conservation, and how they apply to real-world chemical reactions.
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Given:
Enthalpy = -236 kJ( enthalpy decreases, it's an exothermic process)
Work done = -114 kJ
Calculate the change in energy of the gaseous mixture
In thermodynamics, work is defined as the energy transferred to or from a system as a result of a force acting on it through a displacement.
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