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An ideal gas undergoes isothermal expansion at constant pressure. During the process :
- a)enthalpy increases but entropy decreases
- b)enthalpy remains constant but entropy increases
- c)enthalpy decreases but entropy increases
- d)Both enthalpy and entropy remain constant
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
An ideal gas undergoes isothermal expansion at constant pressure. Duri...
Explanation:
Isothermal expansion of an ideal gas occurs at constant temperature. Hence, the internal energy of the gas remains constant as there is no change in the kinetic energy of the gas molecules. However, during the expansion, the volume of the gas increases, and thus, the entropy of the gas also increases.
Enthalpy is defined as the sum of internal energy and pressure multiplied by volume. As the pressure is constant during the process, the enthalpy of the gas remains constant. Hence, option B is the correct answer.
Summary:
- Isothermal expansion occurs at constant temperature.
- Internal energy remains constant.
- Volume and entropy of the gas increase.
- Enthalpy of the gas remains constant as pressure is constant.
Isothermal expansion of an ideal gas occurs at constant temperature. Hence, the internal energy of the gas remains constant as there is no change in the kinetic energy of the gas molecules. However, during the expansion, the volume of the gas increases, and thus, the entropy of the gas also increases.
Enthalpy is defined as the sum of internal energy and pressure multiplied by volume. As the pressure is constant during the process, the enthalpy of the gas remains constant. Hence, option B is the correct answer.
Summary:
- Isothermal expansion occurs at constant temperature.
- Internal energy remains constant.
- Volume and entropy of the gas increase.
- Enthalpy of the gas remains constant as pressure is constant.
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An ideal gas undergoes isothermal expansion at constant pressure. During the process :a)enthalpy increases but entropy decreasesb)enthalpy remains constant but entropy increasesc)enthalpy decreases but entropy increasesd)Both enthalpy and entropy remain constantCorrect answer is option 'B'. Can you explain this answer?
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