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What is the standard condition for calculating the standard enthalpy of formation (ΔHºf) of a compound?
- a)0°C and 1 atm pressure
- b)30°C and 1 atm pressure
- c)298 K and 1 atm pressure
- d)100°C and 1 atm pressure
Correct answer is option 'C'. Can you explain this answer?
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What is the standard condition for calculating the standard enthalpy o...
Standard Enthalpy of Formation (ΔHºf)
The standard enthalpy of formation refers to the change in enthalpy when one mole of a compound is formed from its elements in their standard states. Understanding the conditions under which this is measured is crucial.
Standard Conditions
- The standard conditions for measuring the standard enthalpy of formation are set at:
- Temperature: 298 K (which is equivalent to 25°C)
- Pressure: 1 atm
Reason for Standard Conditions
- Consistency: Using 298 K and 1 atm as standard conditions ensures that the measurements of enthalpy changes are consistent and reproducible across various studies.
- Realistic Conditions: 298 K approximates typical laboratory conditions, making the results more applicable to real-world scenarios.
- Thermodynamic Tables: Most thermodynamic data, including standard enthalpies of formation, are tabulated using these standard conditions, facilitating easier comparisons and calculations.
Understanding the Correct Answer
- While other options present different temperatures, they do not align with the universally accepted standard conditions for thermodynamic measurements.
- Therefore, option 'C' (298 K and 1 atm pressure) is the correct choice, as it adheres to the conventions used in chemistry for defining standard states.
Conclusion
- Always remember that when dealing with thermodynamic properties like standard enthalpy of formation, 298 K and 1 atm are the benchmark conditions that scientists rely on for accurate and consistent results.
The standard enthalpy of formation refers to the change in enthalpy when one mole of a compound is formed from its elements in their standard states. Understanding the conditions under which this is measured is crucial.
Standard Conditions
- The standard conditions for measuring the standard enthalpy of formation are set at:
- Temperature: 298 K (which is equivalent to 25°C)
- Pressure: 1 atm
Reason for Standard Conditions
- Consistency: Using 298 K and 1 atm as standard conditions ensures that the measurements of enthalpy changes are consistent and reproducible across various studies.
- Realistic Conditions: 298 K approximates typical laboratory conditions, making the results more applicable to real-world scenarios.
- Thermodynamic Tables: Most thermodynamic data, including standard enthalpies of formation, are tabulated using these standard conditions, facilitating easier comparisons and calculations.
Understanding the Correct Answer
- While other options present different temperatures, they do not align with the universally accepted standard conditions for thermodynamic measurements.
- Therefore, option 'C' (298 K and 1 atm pressure) is the correct choice, as it adheres to the conventions used in chemistry for defining standard states.
Conclusion
- Always remember that when dealing with thermodynamic properties like standard enthalpy of formation, 298 K and 1 atm are the benchmark conditions that scientists rely on for accurate and consistent results.
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What is the standard condition for calculating the standard enthalpy o...
The standard condition for calculating the standard enthalpy of formation (ΔHºf) of a compound is 298 K (25°C) and 1 atm pressure.
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What is the standard condition for calculating the standard enthalpy of formation (ΔHºf) of a compound?a)0°C and 1 atm pressureb)30°C and 1 atm pressurec)298 K and 1 atm pressured)100°C and 1 atm pressureCorrect answer is option 'C'. Can you explain this answer?
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