Which Way Did That System Go The Gibbs Free Energy

Which Way Did That System Go The Gibbs Free Energy 

3 What is the chemical potential (p,) Is it an intensive or extensive variable  

4 At 300 K, the AGmix of 0.3 moles of ethanol and 0.7 moles of water is -1524 J determine A5mix- (Assume ethanol and water are ideal solutions for this problem.) 

5 Carbon dioxide is formed by the following chemical reaction  

The above reaction has a AG of -257.115 kJ/mole at 25°C 101.3 kPa. What is the equilibrium constant of this reaction  

---