General

Question 1

Term 1 microcanonical ensemble

Answer 1

Controlled quantities E, V. N

Thermodynamic measure: Multiplicity $\Omega(E,V,N)$

$$S = k \ln{\Omega}$$

Question 2

Term 2 canonical ensemble

Answer 2

Quantities we control:
T,V,N

Thermodynmaic measure
Z(V,N,T)

$$f = -kT\ln{Z} = U-TS$$