Question

Effect of temperature on Spontaneity of Reactions?​

Answer 1

Answer:

The temperature plays an important role in determining the Gibbs free energy and spontaneity of a reaction. ... If ΔH is positive, and –TΔS negative, the reaction will be spontaneous at high temperatures (increasing the magnitude of the entropy term).

Explanation:

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Answer 2

Answer:

We know that in thermodynamics, Gibbs free energy is known as thermodynamic potential. Moreover, this potential is used to calculate reversible work by one thermodynamic system that can perform at constant pressure and temperature. The unit of Gibbs Free Energy is Joules and by using Gibbs Free Energy, we can determine the temperature affecting the spontaneity of a reaction.

Complete step-by-step answer:

Here basic thing to know for determining the effect of spontaneity we should know that, spontaneity depends on the sign of ΔGΔG ,likewise ΔGΔG depends on the temperature of the system.

The value of ∆G is given by:

ΔG = ΔH − TΔSΔG = ΔH − TΔS

Here, TT is the temperature of the system or reaction.

ΔGΔG is Gibbs Free Energy and Spontaneity of reaction.

ΔHΔH is Enthalpy of a reaction.

ΔSΔS is Entropy of a reaction.

There are three possible situations:

If 

ΔG < 0 ΔG < 0 

 , the reaction is spontaneous in forward direction.

If 

ΔG = 0ΔG = 0

 , the reaction is at equilibrium.

If 

ΔG > 0ΔG > 0

 , the reaction is not spontaneous in forward direction, and it's also spontaneous in reverse direction.

Now, by that we have four possible situation by which we have depending on signs of ΔHΔH and ΔSΔS and the tabular form is given by:

ΔHΔHΔSΔSHigh TemperatureLow Temperature++++ΔG−ΔG− ; SpontaneousΔG+ΔG+ ; Non Spontaneous