An ideal gas undergoes isothermal expansion at constant pressure. During the process:Enthalpy remains constant but entropy increasesEnthalpy decreases but entropy increasesEnthalpy increases but entropy decreasesBoth enthalpy and entropy remain constant
Question
An ideal gas undergoes isothermal expansion at constant pressure. During the process:Enthalpy remains constant but entropy increasesEnthalpy decreases but entropy increasesEnthalpy increases but entropy decreasesBoth enthalpy and entropy remain constant
Solution
The correct answer is: Enthalpy remains constant but entropy increases.
Here's why:
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Isothermal expansion means the process occurs at a constant temperature.
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For an ideal gas, enthalpy (H) is a function of temperature only. Therefore, if the temperature is constant, the enthalpy will also remain constant.
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Entropy (S), on the other hand, is a measure of the randomness or disorder of a system. In an isothermal expansion, the gas molecules have more volume to move around, increasing the randomness of the system. Therefore, the entropy increases.
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