What is the change in enthalpy in kilojoules when 2.30 mol of Mg is completely reacted according to the following reaction 2 Mg(s)+O₂(g) → 2 MgO(s) ∆H =-1204 kJ
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.
![**Question 8 of 15**
**Problem:**
What is the change in enthalpy, in kilojoules, when 2.30 mol of Mg is completely reacted according to the following reaction:
\[
2 \text{ Mg(s)} + \text{O}_2(\text{g}) \rightarrow \Delta H = -1204 \text{ kJ}
\]
**Interface Description:**
1. **Reset Button**: To clear current inputs.
2. **Answer Section**: Empty field to input the final answer.
3. **Tools and Input Buttons:**
- Multiple calculations blocks, including multiplication and division.
- Number buttons (e.g., 2.30, 1000, 6.02 x 10²³).
- Chemistry constants, e.g., mol Mg, kJ, etc.
**Instructions:**
- Calculate the change in enthalpy using the given enthalpy change for the reaction.
**Diagram Explanation:**
- **Calculation Blocks**: Visual representation to align factors for calculation, such as the starting amount and conversion factors.
- **Operation Symbols**: Indicate multiplication steps necessary for calculations.
**Example Calculation:**
To find the change in enthalpy:
\[
\text{Change in Enthalpy} = \left(\frac{2.30 \, \text{mol Mg}}{2 \, \text{mol Mg}}\right) \times (-1204 \, \text{kJ})
\]
Substitute and solve to find the answer.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F95519f7f-c6cb-4927-8efe-74496574f1d0%2Fc1fbf2b7-9e9c-4b22-b81d-c226b2afe0cf%2Faehfeu_processed.jpeg&w=3840&q=75)
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