[Review Topics] [References] Use the References to access important values if needed for this question. When Fe₂O3(s) reacts with H₂(g) to form Fe(s) and H₂O(g), 98.8 kJ of energy are absorbed for each mole of Fe₂O3(s) that reacts. Write a balanced thermochemical equation for the reaction with an energy term in kJ as part of the equation. Note that the answer box for the energy term is case sensitive. Use the SMALLEST INTEGER coefficients possible and put the energy term in the last box on the appropriate side of the equation. If a box is not needed, leave it blank. Submit Answer -> Retry Entire Group 7 more group attempts remaining
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: Writing Thermochemical Equations
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**Problem Statement:**
When Fe₂O₃(s) reacts with H₂(g) to form Fe(s) and H₂O(g), 98.8 kJ of energy are absorbed for each mole of Fe₂O₃(s) that reacts.
**Task:**
Write a balanced thermochemical equation for the reaction with an energy term in kJ as part of the equation. Note that the answer box for the energy term is case sensitive.
Use the SMALLEST INTEGER coefficients possible and put the energy term in the last box on the appropriate side of the equation. If a box is not needed, leave it blank.
**Equation Format:**
\[ \underline{\phantom{aa}} \text{ } \text{Fe}_2\text{O}_3(s) + \underline{\phantom{aa}} \text{ } \text{H}_2(g) \rightarrow \underline{\phantom{aa}} \text{ } \text{Fe}(s) + \underline{\phantom{aa}} \text{ } \text{H}_2\text{O}(g) + \underline{\phantom{aa}} \text{ } \text{Energy} \]
- **Energy**: \(98.8 \text{ kJ}\)
**Actions:**
1. Identify and balance the chemical equation with the smallest integer coefficients.
2. Include the energy term on the appropriate side of the equation.
3. Submit your answer when completed.
Note: The answer format is sensitive, ensure correct capitalization for the energy unit.
**Tools Available:**
- **Submit Answer**: Input your response for evaluation.
- **Retry Entire Group**: Reset all input attempts.
- **Group Attempts Remaining**: 7 more attempts.
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A chemical equation, which gives the heat change (evolved or absorbed) during the reaction, is called the thermo chemical equation.
The reactions in which heat energy is liberated are called exothermic reactions and for such reactions, the change in enthalpy, format('truetype')%3Bfont-weight%3Anormal%3Bfont-style%3Anormal%3B%7D%3C%2Fstyle%3E%3C%2Fdefs%3E%3Ctext%20font-family%3D%22math1ed582716bfb4738ccd92405301%22%20font-size%3D%2216%22%20text-anchor%3D%22middle%22%20x%3D%227.5%22%20y%3D%2216%22%3E%26%23x2206%3B%3C%2Ftext%3E%3C%2Fsvg%3E)
H is negative.
The reactions in which heat energy is absorbed are called endothermic reactions and for such reactions, the change in enthalpy, H is positive.
If the heat energy is released it must be written on the product side and if heat energy is absorbed it must be written on the reactant side.
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