ChE Thermodynamics Flashcards
Which law is the basis for the manufacture of thermometers?
Zeroth law of thermodynamics
Energy is added to the water as work but is extracted from the water as heat was performed by
Joule
These properties depend on the current state of the system and not on how the system reaches that state
State functions
Which of the following statement is correct?
A. The standard heat of formation of an element is negative.
B. Since delta H= delta U + delta PV and can never be equal to delta U.
C. Q and W are state functions.
D. Q + W is a state function.
D. Q + W is a state function.
The amount of heat absorbed when CO2 gas reacts with a solid CaO to form solid CaCO3 is measured in a bomb calorimeter at constant volume. The data obtaineds give a direct measure of
delta U
Notes:
Bomb calorimeter= constant volume
Q= delta U
Open type calorimeter= constant pressure
Q= delta H
For a constant presshre reversible process, the enthalpy change of the system is
Integral of CpdT
Cv is given by
(δU/δT)V
subscript yung V
Equation which relates pressure, volume, and temperature of a gas is called
Equation of state
The equation, PV=nRT is best obeyed by gases at
Low pressure and high temperature
Compressibility factor of a gas is
Unity, if it follows PV=nRT
Cp-Cv=R is valid for
Ideal gases
For monoatomic gases, Cp/Cv equals
1.67 or 5/3
Isobaric process means a constant
Pressure process
For an isothermal process the internal energy of a gas
Remains unchanged
In an adiabatic process
Heat transfer is zero
