Gibbs Free Energy

Gibb's Free Energy and Spontaneity

Gibb's Free Energy and Spontaneity | Thermal Expansion | Linear Expansion | Area Expansion | Volume Expansion | Buoyancy Problems

In the following questions , a statement of assertion (A) is followed by a statement of reason (R). A : For every chemical reaction at equilibrium, the value of standard Gibbs free energy change is zero. R: At constant temperature and pressure for a reaction that direction is preferred for which Gibbs free energy increases.

I. Read the following passage and answer questions 1-5 that follows: Spontaneity means the feasibility of a reaction.Gibbs free energy (G) is the thermodynamic quantity which helps in predicting the spontaneity of a process G = H - TS The change in free energy is represented by Gibbs Helmoltz equation, DeltaH - DeltaH - TDeltaS For spontaneity of a process, DeltaG must be negative.It depends upon energy factor (DeltaH) and entropy factor (TDeltaS) . 1. What are the signs of DeltaH and DeltaS for the reactions : 2CI(g) to CI_(2)(g) ?

For a substance A, vapour pressure of liquid and solid state at temperature 400K is 0.1 "bar" and 0.16 "bar" respectively. What will be Gibbs free energy change for the following process. A(s)[0.1"bar",400K,n=1]toA(l) [0.16"bar",400K,n=1]

Gibb's free energy G is defined as

Gibb's free energy and spontaneity of a Chemical Reactions

The standard Gibb's free energy change, DeltaG^(@) is related to equilibrium constant, kp as