Process Control and Instrumentation - Chemical Engineering Questions and Answers

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The expression for entropy change given by, ΔS = - nR ln (P₂/P₁), holds good for

expansion of a real gas.

reversible isothermal volume change.

heating of an ideal gas.

cooling of a real gas.

With increase in temperature, the internal energy of a substance

increases

decreases

remains unchanged

may increase or decrease; depends on the substance

It is desired to bring about a certain change in the state of a system by performing work on the system under adiabatic conditions.

The amount of work needed is path dependent.

Work alone can not bring out such a change of state.

The amount of work needed is independent of path.

More information is needed to conclude anything about the path dependence or otherwise of the work needed.

For a constant pressure reversible process, the enthalpy change (ΔH) of the system is

C_v.dT

C_p.dT

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