Chemical Engineering Thermodynamics
Gibbs-Duhem equation

Applies only to binary systems
None of these
States that n₁dμ₁ + n₂dμ₂ + ....njdμj = 0, for a system of definite composition at constant temperature and pressure
Finds no application in gas-liquid equilibria involved in distillation

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Chemical Engineering Thermodynamics
Steam undergoes isentropic expansion in a turbine from 5000 kPa and 400°C (entropy = 6.65 kJ/kg K) to 150 kPa) (entropy of saturated liquid = 1.4336 kJ/kg . K, entropy of saturated vapour = 7.2234 kJ/kg. K) The exit condition of steam is

Saturated vapour
Superheated vapour
Partially condensed vapour with quality of 0.1
Partially condensed vapour with quality of 0.9

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