Question

How many phase rule variables must be specified to fix the thermodynamic state of each of
the following systems?
(a) Water existing at its triple point (liquid, solid and vapour phases are co-existing at
equilibrium) [1]
(b) Benzene and toluene in a sealed flask existing in two phases (liquid and vapour) at
equilibrium [1.5]
(c) Liquid water saturated with air (assume air as a mixture of N2 and O2)

Answer 1

Answer:

Gas–liquid–solid triple point

The single combination of pressure and temperature at which liquid water, solid ice, and water vapor can coexist in a stable equilibrium occurs at approximately 273.1575 K (0.0075 °C; 32.0135 °F) and a partial vapor pressure of 611.657 pascals (6.11657 mbar; 0.00603659 atm).

Explanation:

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