Mercury vapor is dangerous because breathing it brings this toxic element into the lungs. We wish to estimate the vapor pressure of mercury at two different temperatures from the following data:

Estimate the temperature at which K_p for the process Hg(ℓ) ⇄ Hg(g) is equal to 1.00 (and the vapor pressure of Hg is 1.00 bar). Next, estimate the temperature at which the vapor pressure is (1/760) bar. (Experimental vapor pressures are 1.00 mm Hg at 126.2°C and 1.00 bar at 356.6°C.) 

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ΔH° (kJ/mol) Hg(e) 0 Hg(g) 61.38 Sº (J/K.mol) 76.02 174.97 A Gº (kJ/mol) 0 31.88