3. For pure ammonia, the temperature dependences of saturated vapor pressure are known at equilibrium liquid - vapor and crystals - vapor
Crystals-steam T, K 164.1 172.4 181.3 192.3 194.0
R, Pa 133 403 1333 4447 5333
Liquid-vapor T, K 198.9 208.3 216.2 227.8 239.6
R, Pa 7999 18033 26600 53330 101320
At the triple point, the mass densities in the liquid and crystalline states are 817 and 827 kg/m3, respectively.
Find:
1. Construct graphs of the dependence of saturated vapor pressure on temperature P = f(T) and a graph of lnP = f(1/T)
2. Determine the coordinates of the triple point.
3. Calculate graphically the molar heats of evaporation and sublimation, assuming that they do not depend on temperature.
4. Determine the molar heat of fusion.
5. Find the melting point of the substance (Tmelt) at p = 8•107 Pa.

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