In which case change in entropy is negative?

  • Option 1)

    Evapouration of water

  • Option 2)

    Expansion of a gas at constant temperature

  • Option 3)

    Sublimation of solid to gas

  • Option 4)

    2H_{(g)} \rightarrow H_2_{(g)}

Answers (1)

 

Gibb's free energy (? G) -

\Delta G= \Delta H-T \Delta S
 

- wherein

\Delta G= Gibb's free energy

\Delta H= enthalpy of reaction

\Delta S= entropy

T= temperature

 

 

 

2H_{(g)} \rightarrow H_2_{(g)}

degree of randomness decreases

\therefore entropy decreases and is negative.


Option 1)

Evapouration of water

Option 2)

Expansion of a gas at constant temperature

Option 3)

Sublimation of solid to gas

Option 4)

2H_{(g)} \rightarrow H_2_{(g)}

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