Multiple choice

During isothermal expansion of ideal gas its

  1. internal energy increases

  2. enthalpy increases

  3. enthalpy remains constant

  4. enthalpy reduces to zero
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Enthalpy is a thermodynamic function of a system. It is equivalent to the sum of the internal energy of the system plus the product of its volume multiplied by the pressure exerted on it by its surroundings. Since heat is absorbed from the surroundings therefore the enthalpy of the ideal gas increases.

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