14. Which relationship is correct? (a) (T/V)S=(P/S)V (b) (T/P)S=(V/S)P (c) (S/V)T=(P/T)V (d) (S/P)T=(V/T)P (e)none of the above. 15. The chemical potential of species i(i) is equal to (a) (Gi)T,v,nj (b) (Ui)T,v,uj2 (c) (Hi)T,v,nj (d) (Ai),v,nj (e) none of the above