hi to every one, i have a need for formulas or sto calculate actual water vapor pressure and enthalpy?

Answer 1

Since you didn't give a temperature range for the water vapor pressure I refer you to wiki, refs. 1 and 2, for general information including references to specific formulas.
Enthalpy H = U + PV, where U is the internal energy, P is pressure and V is volume. See ref 3.