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Fundamentals of thermodynamics

For which of the processes is S negative 


The thermodynamic quantity of the system, the decrease in whose value during a process is equal to useful work done by the system  i,e., ΔG=ΔHTΔS,  H= enthalpy S= entropy and T= absolute temperature. 

If an endothermic reaction occurs spontaneously i.e ΔH=+ ve  then for reaction to be spontaneous G should be negative that is only possible when ΔS>0 at constant temperature and pressure.

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