1. Tardigrade
  2. Question
  3. Chemistry
  4. Values of Δ H and Δ S for five different reactions are given below: Reaction Δ H ( kJ mol -1) Δ S( J K -1 mol-1) I +98.0 +14.8 II -55.5 -84.8 III +28.3 -17.0 IV -40.5 +24.6 On the basis of these values predict which one of these will be spontaneous at all temperatures?

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Q. Values of $\Delta H$ and $\Delta S$ for five different reactions are given below:
Reaction $\Delta H \left( kJ mol ^{-1}\right)$ $\Delta S\left( J K ^{-1} mol^{-1}\right)$
I +98.0 +14.8
II -55.5 -84.8
III +28.3 -17.0
IV -40.5 +24.6

On the basis of these values predict which one of these will be spontaneous at all temperatures?

Thermodynamics

Solution:

For reaction IV, $\Delta H=- ve$ and $\Delta S=+ ve$, hence $\Delta G=- ve$ at all temperatures.