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Entropy is a measure of randomess of sys...

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)`
The temperature at whicgh liquid `H_(2)O`will be in equrilibrium with its vapour is (`Delta H and Delta S` for vapourisation are 50 kJ `mol^(-1)` and 0.15 kJ `mol^(-1)K^(-1)`)

A

`77.30^(@)C`

B

`60.33^(@)C`

C

`50^(@)C`

D

`100^(@)C`

Text Solution

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The correct Answer is:
B
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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

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)) For which of the following cases, DeltaS = (DeltaH)/(T) ?

Knowledge Check

  • 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

  • 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) The change in entropy when 1 mole O_(2) gas expands isothermally and reversibly from an initial volume 1 litre to a final volume 100 litre at 27^(@)C

    A
    `20.5JK^(-1(mol^(-1)`
    B
    `38.29 JK^(-1)mol^(-1)`
    C
    `42.50 JK^(-1)mol^(-1)`
    D
    `50.65 JK^(-1)mol^(-1)`

  • Entropy change in reversible adiabatic process is:

    A
    infinite
    B
    zero
    C
    equal to `C_(V)DeltaT`
    D
    equal to nR ln `((V_(2))/(V_(1)))`

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