Chemical equilibrium of the reactive systems of benzyl alcohol with tert-alkyl ethers was studied in the liquid phase in the temperature range (298 to 373) K and with a cation exchanger Amberlist 15 as a catalyst. Enthalpies of reactions involving benzyl alcohol were obtained from the temperature dependence of the equilibrium constants according to the Second Law and used to derive averaged standard enthalpies of formation of benzyl alcohol Delta(f)H(m)degrees((1,298.15K)) = -(154.5 +/- 1.7) kJ(.)mol(-1) in the liquid state. Vapor pressures and enthalpy of vaporization, Delta(l)(g)H(m(298.15 K)), of benzyl alcohol were determined using transpiration method. The latter value, together with the reliable literature data, provided an averaged result Delta(l)(g)H.(298.15 K) = (65.75 +/- 0.51) kJ(.)mol(-1). Both averaged results for Delta(f)Hdegrees(m(1,19115K)) and Delta(l)(g)H(m(298.15 K)) were used to calculate and to recommend the value of enthalpy of formation of benzyl alcohol in the gaseous state Delta(f)Hdegrees(m(g,298.15K)) = -(88.8 1.8) kJ(.)mol(-1). Auxiliary data for tert-butyl benzyl ether (energy of combustion, vapor pressures, and enthalpy of vaporization) were measured using calorimetry and transpiration method.