In thermodynamics under state variables, :(no. Of moles) is not included? Why? Only p,V,T are included?

State variables are those,whose values define the state function,and change in state variable,changes the state function. 
But,no. of moles is not a state variable ,since change in no. of moles does not alter the state function. For e.g free energy is a state function,whose value is in KJ/mole o .

So,if we say, to burn 1 mole of carbon,-200 KJ/mole free energy is released. 
                  and,to burn 2 mole of carbon $$\begin{gathered} \frac{-200}{2}\times \frac{KJ}{{\displaystyle \frac{1}{2}}mole} \\ =\frac{-200\times 2}{2}KJ/mole \\ = -200 KJ/mole \end{gathered}$$   

So,the value of state function does not change.