Extensive properties depend on the amount of substance: U, H, S, G, V, mass, n, Cp, q, w. Intensive properties are independent of amount: T, P, density, molar quantities (Sm, Hm), $E_{cell}$, chemical potential. When comparing $delta_H$ values, always note the stoichiometric coefficients: 2H2 + O2 -> 2H2O has $delta_H$ = -572 kJ, but H2 + 1/2 O2 -> H2O has $delta_H$ = -286 kJ. The same reaction at different scales gives different $delta_H$ values (extensive), but $E_{cell}$ would be the same (intensive).