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?

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 ?