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WorksheetsCHEE2015 - Phase Equilibria of Pure Fluids
Total questions: 10
Worksheet time: 11mins
From the phase diagram of pure component, a non-condensable gas is found at
Above the critical point.
Below the critical point.
On the critical point.
On the equilibrium line.
Incorrect statement about a phase diagram of pure substance is
Phase diagram are based on equilibrium conditions.
Phase diagrams enable to view the properties of two or more phases as a function of temperature, pressure and other variables.
For phase equilibrium, it is assumed that the phase remain invariant.
The degree of freedom for liquid phase equals to 1.
If the vapour and liquid of a pure component are in equilibrium, the equilibrium pressure is called
partial pressure.
vapour pressure.
liquid pressure.
none of the mentioned.
Water will _______ on melting process and has the fusion curve with a _______ slope.
contracts, negative
contracts, positive
expands, negative
expands, positive
The vapor pressure of carbon tetrachloride (CCl4) at 40.0 °C is found to be 213 mmHg and 836 mmHg at 80.0 °C. What is the enthalpy of vaporization in kJ/mol?
(R = 8.314 J/mole K)
31.4
3.14
0.314
314
The molar enthalpy of vaporization of hexane (C6H14) is 28.9 kJ/mol, and its normal boiling point is 68.73 °C. What is the vapor pressure of hexane at 25 °C?
(R = 8.314 J/mole K)
17.1 torr
760 torr
171 torr
780 torr
Below are the assumptions used in the Clausius - Clapeyron equation, except:
Molar volume of liquid is much smaller than vapour.
Vapour phase is an ideal gas.
Heat of vapourization is independent of temperature.
It only applicable for vapor pressure curve.
Find the incorrect statement about fugacity for pure component:
The fugacity for a single-component ideal gas is equal to its pressure.
Fugacity is an extensive variable, so it depends on the amount of the phase.
The fugacity for a single-component liquid is equal to its saturation pressure if pressure is low enough that the gasphase is ideal.
The fugacity of a liquid or solid does not change much as pressure increases.
What is the fugacity of water at 80oC?
1 bar
0.4736 bar
4.736 bar
0.7011 bar
Which of the following increases the fugacity of a component A?
Change phase (conversion) from solid to liquid.
Change phase (conversion) from liquid to solid.
Decreasing pressure.
None of the mentioned.
