What is the change in enthalpy when 4.04 grams H₂ reacts with excess oxygen according to the following balanced chemical reaction: 2 H₂(g) + O₂(g) - ΔΗ = -572 kJ 2 H₂O(l)
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.
![**Enthalpy Change Calculation for Combustion Reaction**
**Problem Statement:**
Determine the change in enthalpy when 4.04 grams of hydrogen (H₂) react with excess oxygen according to the following balanced chemical reaction:
\[ 2 \text{H}_2(g) + \text{O}_2(g) \rightarrow 2 \text{H}_2\text{O}(l) \]
Given:
- \(\Delta H = -572 \, \text{kJ}\)
**Calculation Steps:**
1. **Starting Amount:**
- Enter the amount of hydrogen: **4.04 grams H₂**
2. **Conversion Setup:**
- Formulate a conversion factor setup, using the given balanced chemical equation and enthalpy change.
3. **Additional Factors:**
- Available factors include various numerical values and units necessary for conversions, such as grams, moles, and kilojoules. Use these to convert mass to moles and relate them to the enthalpy change.
**Tools Provided:**
- **ADD FACTOR:** Use this to multiply by any conversion factors needed.
- **ANSWER:** Place the calculated result here.
- **RESET:** Clear the inputs to start over.
This tool helps convert mass to moles and use stoichiometry to find the enthalpy change for the reaction. Choose appropriate conversion factors to solve the problem.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F93724627-c7b6-406b-9a00-d0dcd2c570ce%2F328e9949-aaa9-4426-b881-10dd7785f6a3%2Fnylvboc_processed.png&w=3840&q=75)
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