Chemical Engineering Thermodynamics - Study Mode

[#366] Maximum work that could be secured by expanding the gas over a given pressure range is the __________ work.
Correct Answer

(A) Isothermal

Explanation

Solution: The isentropic process is nothing but reversible adiabatic process since between the isothermal and adiabatic process the isothermal process has maximum area under $$P-V$$ xa0diagram the isothermal process will have maximum work done during expansion. Since the slope of $$p-v$$ xa0 plot for adiabatic process is greater than isothermal process.

[#367] The fusion of a crystalline solid at its melting point to form a liquid at the same temperature is accompanied by
Correct Answer

(C) Increase in enthalpy corresponding to absorption of heat

Explanation

Solution: During fusion process the heat is absorbed by the solid to convert to liquid leading to increase in enthalpy.

[#368] The minimum number of phases that can exist in a system is
Correct Answer

(B) 1

Explanation

Solution: A phase indicates physically how a matter is existing. So, minimum it should be $$=1.$$

[#369] Extensive properties of a thermodynamic system depend upon the __________ of the system.
Correct Answer

(C) Mass

Explanation

Solution: Extensive properties are those which depend upon the extent ($$mass,$$) of the system. Typical extensive properties are volume, internal energy, Gibbs free energy etc..,

[#370] Van Laar equation deals with the activity co-efficients in
Correct Answer

(A) Binary solutions

Explanation

Solution: Van Laar equation is an activity based model developed by Van Laar during 1910-1913. Which will be very useful during vapor-liquid equilibrium calculations and the equations for a binary mixture are given as : $$eqalign{
& ln{gamma _1} = frac{{AX_2^2}}{{{{left( {frac{{A{X_1}}}{B} + {X_2}}
ight)}^2}}} cr
& ln{gamma _2} = frac{{BX_1^2}}{{{{left( {frac{{B{X_2}}}{A} + {X_1}}
ight)}^2}}} cr} $$