Download - Ideal Gases
Ideal GasesContributions by:
John L. Falconer & Will MedlinDepartment of Chemical and Biological Engineering
University of ColoradoBoulder, CO 80309-0424
Supported by the National Science Foundation
A rigid tank contains CO2 at 2 atm and 50°C. When the tank is heated to 250°C, the pressure increases significantly and the gas density ____________.
A. increases
B. decreases
C. remains the sameGas
The pressure of an ideal gas in a fixed volume container is doubled without changing the number of moles of the gas. The average velocity of the particles should __________.
A. not change
B. be doubled
C. be halved
D. be quadrupled
E. none of the above
An ideal gas (water) enters a compressor, and the exiting water is a real fluid. The shaft work will be ____________ that obtained if the exiting water could be considered an ideal gas.
A. higher than
B. lower than
C. the same as
1 mol CH4 (1 bar, 50°C) is mixed with 1 mol O2 (1 bar, 50°C) to form a mixture at 2 bar and 50°C. Assume ideal gases. The Gibbs free energy change is _____________.
A. positive
B. negative
C. zero
D. Need more information
Which system has the highest internal energy if one mole of the same ideal gas is in each piston-cylinder?
A. A
B. B
C. Both have the same internal energy
2 atm
50°C
10 atm50°C
A B
A constant-volume tank contains CO2 at 2 atm. Nitrogen is injected into the tank. If the CO2 all remains in the tank, its partial pressure ____________. Assume ideal gases and an isothermal system.
A. decreases
B. increases
C. stays the same
CO2
N2
A constant-volume tanks contains 4 mol CO2 and 1 mol N2 at a total pressure of 2 atm. The N2 is removed completely through a membrane that allows only N2 to permeate. If all the CO2 remains in the tank, the partial pressure of CO2 ___________. Assume ideal gases and an isothermal system.
A. decreases
B. increases
C. stays the same CO2 + N2
membrane N2
An ideal gas is at 1 atm in a piston-cylinder. The piston is weightless and frictionless. When the mass is removed from the piston, the gas temperature ____________.
A. increases
B. decreases
C. remains the same1 kg
Vacuum
Gas
Piston
Weight
Stopper
1 mol CO2 and 2 mol N2 are heated at constant pressure. The partial pressure of the CO2 _________. Assume ideal gases.
A. increases
B. decreases
C. stays the same
Start
1 kg
1 mol CO2
2 mol N2
1 mol CO2
2 mol N2
After heating
1 kg
CO2
N2
1 mol CO2 and 2 mol N2 are in a container at 100°C. The container is then placed in an ice bath at constant pressure. The partial pressure of the CO2 _________. Assume ideal gases.
A. increases
B. decreases
C. stays the same
1 kg
Gas
PistonWeight
1 kg
Gas
Start After cooling
A fixed volume tank has water in VLE. A mole of air was added to the system. All gases are ideal. The amount of liquid water ___________.
A. increases
B. decreases
C. stays the sameVapor
Liquid
1 mol air
A fixed-volume tank contains CO2 and N2, both of which are ideal gases. One mole of O2, also an ideal gas, is added. The partial pressure of H2 __________.
A. increases
B. decreases
C. stays the same
PCO2 = 0.6 atm
PN2 = 0.5 atm
1 mol O2
A gas is heated and expands in a sealed, frictionless, piston-and cylinder arrangement, where the piston mass and the atmospheric pressure above the piston remain constant. The pressure of the gas will _________.
A. increase
B. remain the same
C. decrease
D. Insufficient information
Start
1 kg
Gas 1 mol CO2
2 mol N2
After heating
1 kg
Gas
Volume
B
Pres
sure
E A
C
D
Which line corresponds to an isotherm?
A B C
D E
Which is the correct plot of enthalpy vs. mole fraction of one component for a binary mixture of ideal gases?
yi
H
yi
H
yi
H
yi
H
yi
H
A B C
D E
Which is the correct plot of Gibbs free energy vs. yi for a binary mixture of ideal gases?
yi
G
yi
G
yi
G
yi
G
yi
G
A membrane divides a rigid, well-insulated 2 m3 tank into equal parts. The left side contains an ideal gas (Cp = 30 J/mol K) at 300 K and 10 bar and the right side is a vacuum. If the membrane ruptures, what will be the final temperature of the gas?
A. 200 K
B. 300 K
C. 400 K
D. Need more information
Gas Vacuum
Membrane
A rigid isolated vessel is divided by a barrier into two chambers of equal volume. One side contains an idealmonatomic gas, the other side contains vacuum. If the barrier is removed, the temperature of the gas will __________.
A. double
B. be cut in half
C. not change
D. go to absolute zero
Ideal monotomic
gasVacuum
PistonRemoveStoppers
A rigid vessel is divided by a barrier into two chambers of equal volume. One side contains a real gas, the other side contains vacuum. If the barrier is removed, the temperature of the gas will _____________.
A. go to absolute zero
B. increase
C. decrease
D. not change
Real gas Vacuum
PistonRemoveStoppers
What is ∆U when N2 and O2 (ideal gases) are mixed at constant pressure?
A. Positive
B. Negative
C. Zero
Does energy have to be added to a mixture of N2 and O2 (ideal gases) to separate them at constant pressure?
A. Yes, add energy
B. No, remove energy
C. No energy exchange is needed