Question: What is the change in enthalpy for an isothermal process?
Options:
Zero
Positive
Negative
Depends on the system
Correct Answer: Zero
Solution:
In an isothermal process, the temperature remains constant, and for an ideal gas, the change in enthalpy is zero.
What is the change in enthalpy for an isothermal process?
Practice Questions
Q1
What is the change in enthalpy for an isothermal process?
Zero
Positive
Negative
Depends on the system
Questions & Step-by-Step Solutions
What is the change in enthalpy for an isothermal process?
Correct Answer: Zero
Step 1: Understand what an isothermal process is. It is a process that occurs at a constant temperature.
Step 2: Know that enthalpy is a measure of the total energy of a system, including internal energy and the energy required to make room for it (pressure-volume work).
Step 3: For an ideal gas, the enthalpy depends only on temperature.
Step 4: Since the temperature does not change in an isothermal process, the enthalpy also does not change.
Step 5: Therefore, the change in enthalpy (ΔH) for an isothermal process is zero.
Isothermal Process – An isothermal process is a thermodynamic process in which the temperature of the system remains constant.
Enthalpy Change – Enthalpy change refers to the heat content change of a system at constant pressure.
Ideal Gas Behavior – For an ideal gas, the internal energy is a function of temperature only, leading to a zero change in enthalpy during isothermal processes.
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