Hess's Law
Which statement best describes Hess's Law?
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Solution
Enthalpy change is path-independent
- Hess's Law Statement: The total enthalpy change for a chemical reaction is the same, regardless of whether the reaction occurs in one step or in several steps.
- State Function: This is a direct consequence of enthalpy (H) being a state function. It depends only on the initial and final states of the system.
- Application: It allows the calculation of ΔH for reactions that are difficult to measure directly by summing the ΔH values of other related reactions.
- Equation: ΔHnet=∑ΔHsteps.
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More hess's law Practice Questions
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C(s) + O₂(g) → CO₂(g); ΔH = −393 kJ mol⁻¹
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Given: C(s) + O₂(g) → CO₂(g); ΔH = −393 kJ mol⁻¹ CO(g) + ½O₂(g) → CO₂(g); ΔH = −283 kJ mol⁻¹ T...
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About This Question
- Subject
- chemistry
- Chapter
- chemical thermodynamics
- Topic
- hess's law
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Enthalpy change is path-independent
- Hess's Law Statement: The total enthalpy change for a chemical reaction is the same, regardless of whether the reaction occurs in one step or in several steps.
- State Function: This is a direct consequence of enthalpy (H) being a state function. It depends only on the initial and final states of the system.
- Application: It allows the calculation of ΔH for reactions that are difficult to measure directly by summing the ΔH values of other related reactions.
- Equation: ΔHnet=∑ΔHsteps.
This easy difficulty chemistry question is from the chapter chemical thermodynamics, covering the topic of hess's law. It appeared in the 2025 exam.
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