What is the effect of temperature on spontaneity?

What is the sign of ∆S for a spontaneous process?

Is the entropy of the universe constant?

What is the relation between enthalpy change and entropy change for a process at equilibrium?

What is the enthalpy of formation of the most stable form of an element in its standard state?

96.

Predict the sign of entropy change for the reactions:

Predict the sign of entropy change for the reactions:

A reaction  is found to have a positive entropy change. The reaction will be

• possible at high temperature
  
  

• possible only at low temperature
• not possible at any temperature
• possible at any temperature

Why should entropy increase on expansion of a gas?

Define standard enthalpy of vaporization ?