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What is entropy change?Predict the sign ...

What is entropy change?Predict the sign of entropy chsnge in each of the following giving reasons for your predictions :
(i) `H_(2) (at 25^(@)C, 1 atm) to H_(2)(at 25^(@)C` and 10 atm))
(ii) `H_(2)O(at 25^(@)C, 1 atm ) to H_(2)O(at 50^(@)C` and 1 atm))
(iii) `2NH_(4)NO_(3)(s) to 2N_(2)(g) + 4H_(2)O(g) + O_(2)(g)`

Text Solution

Verified by Experts

(i)`DeltaS = -ve` entropy decreases with increase in pressure
(ii) `DeltaS = + ve` entropy increases with increase in temperature.
`DeltaS = + ve` gases are produced.
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Knowledge Check

  • Which of the followingk is true for the process H_(2) O (s) = H_(2) O (l) at 0^(@)C and 1 atm?

    A
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    B
    `Delta S = Delta H//T`
    C
    `Delta S = 0`
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    `Delta H = Delta U`

  • Which of the following is true for a reaction H_(2)O(l)toH_(2)O(g) at 100^(@)C , 1 atm. Pressure

    A
    `DeltaH=DeltaE`
    B
    `DeltaE=0`
    C
    `DeltaH=0`
    D
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  • For the process H_(2)O(l) to H_(2)O(g) at T=100^(@)C and p=1 atm, the correct choice is

    A
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    B
    DeltaS_(sys)gt0"and"DeltaS_(sur)lt0`
    C
    DeltaS_(sys)lt0"and"Delta_(sur)gt0`
    D
    `DeltaS_(sys)lt0"and"DeltaS_(sur)lt0`

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