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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)`
Entropy change in a reversible adiabatic process is

A

Zero

B

Always positive

C

Always negative

D

Sometimes positive and sometimes negative

Text Solution

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The correct Answer is:
A
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Entropy change in reversible adiabatic process is:

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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) )

Entropy change for an adiabatic reversible process is

Entropy change for an adiabatic reversible 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)) The entropy change in an adiabatic process is

Delta S = Delta H//T holds good for