Chemical Engineering Thermodynamics
If the heat of solution of an ideal gas in a liquid is negative, then its solubility at a given partial pressure varies with the temperature as

Solubility increases as temperature decreases
Solubility increases as temperature increases
Solubility increases or decreases with temperature depending on the Gibbs free energy change of solution
Solubility is independent of temperature

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

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