Chemical Engineering Thermodynamics
High pressure steam is expanded adiabati-cally and reversibly through a well insulated turbine, which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by ΔH and ΔS respectively for this process:

Δ H ≠ 0 and ΔS ≠ 0
Δ H ≠ 0 and ΔS = 0
Δ H = 0 and ΔS ≠ 0
Δ H = 0 and ΔS = 0

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Chemical Engineering Thermodynamics
Choose the condition that must be specified in order to liquify CO₂ (triple point for CO₂ is - 57°C and 5.2 atm).

Temperature must be kept above - 57°C
Pressure must be kept below 5.2 atm
Pressure must be kept below 5.2 atm. and temperature must be kept above 57°C
Pressure and temperature must be kept below 5.2 atm. and - 57°C respectively

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Chemical Engineering Thermodynamics
The necessary condition for phase equilibrium in a multiphase system of N components is that the

None of these
Chemical potentials of all components should be same in a particular phase
Sum of the chemical potentials of any given component in all the phases should be the same
Chemical potentials of a given component should be equal in all phases

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