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Entropy change for an adiabatic reversib...

Entropy change for an adiabatic reversible process is

A

zero

B

`+ve`

C

`-ve`

D

negative or zero

Text Solution

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The correct Answer is:
A
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Calculate the total entropy change for the following reversible processes: a. Isothermal b. Adiabatic

The thermodynamic property that measures the extent of molecular disorder is called entropy. Entropy change of phase transformation can be calculated using Trouton's formula (DeltaS = DeltaH//T) . In the reversible adiabatic process, however, DeltaS will be zero. the rise in temperature in isobaric and isochoric conditions is found to increase the randomness or entropy of the system. DeltaS = 2.303 C log (T_(1)//T_(2)) The entropy change in an adiabatic process is

Knowledge Check

  • An adiabatic reversible process is one in which?

    A
    Temperature of the system is not change
    B
    The system is not closed to heat transfer
    C
    There is no change in entropy
    D
    There is no net work done

  • Free energy change for a reversible process is

    A
    `gt0`
    B
    `lt0`
    C
    equal to zero
    D
    unpredictable

  • Entropy is a measure of randomess of system. When a liquid is converted to the vapour state entropy of the system increases. Entropy in the phase transformation is calculated using Delta S = (Delta H)/(T) but in reversible adiabatic process Delta S will be zero. The rise in temperature in isobaric or isochoric process increases the randomness of system, which is given by Delta S = "2.303 n C log"((T_(2))/(T_(1))) C = C_(P) or C_(V) Entropy change in a reversible adiabatic process is

    A
    Zero
    B
    Always positive
    C
    Always negative
    D
    Sometimes positive and sometimes negative

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    Which of the following expression for entropy change of an irreversible process ?

    Entropy change in reversible adiabatic process is:

    Consider the following statements: I. Change in enthalpy is always smaller than change in internal energy. II. The variation in enthalpy of a reaction with temperature is given by Kirchhoff's equation. III. The entropy change in reversible adiabatic process is equal to zero. Select the correct answer.

    Entropy ( S ) is a thermodynamic variable like pressure P , volume V and temperature T . Entropy of a thermodynamic system is a measure of disorder of molecular motion. Greater is disorder , greater is entropy. Change in entropy of a thermodynamic system is the ratio of heat supplied to absolute temperature.In an adiabatic reversible process, entropy remains constant while in any irreversible process entropy increases. In nature the processes are irreversible , therefore entropy of universe is continuoulsy increasing. The unit of entropy in S-I system is -

    Entropy ( S ) is a thermodynamic variable like pressure P , volume V and temperature T . Entropy of a thermodynamic system is a measure of disorder of molecular motion. Greater is disorder , greater is entropy. Change in entropy of a thermodynamic system is the ratio of heat supplied to absolute temperature.In an adiabatic reversible process, entropy remains constant while in any irreversible process entropy increases. In nature the processes are irreversible , therefore entropy of universe is continuoulsy increasing. When milk is heated , its entropy :

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