FiltersDone

Question type

Essay

Multiple Choice

Short Answer

True False

Matching

Exam 10: Gases

Show Answer

Share

---

All types

Filters

Study FlashcardsPractice ExamLearn

Question 1

Multiple Choice

Review LaterAdd Note

Review Later

What is the density of Ar(g) at -11°C and 675 mmHg? (R = 0.08206 L • atm/K • mol, 1 atm = 760 mmHg)

A) 1.52 g/L
B) 1.65 g/L
C) -39.3 g/L
D) 40.0 g/L
E) 1.25 kg/L

Correct Answer

verified

B

Question 2

Multiple Choice

Review LaterAdd Note

Review Later

Deviations from the ideal gas law are greater at

A) low temperatures and low pressures.
B) low temperatures and high pressures.
C) high temperatures and high pressures.
D) high temperatures and low pressures.

Correct Answer

verified

Show Answer

Question 3

Multiple Choice

Review LaterAdd Note

A sample of nitrogen gas at 298 K and 745 torr has a volume of 37.42 L. What volume will it occupy if the pressure is increased to 894 torr at constant temperature?

What is the molar mass of an unknown gas if a sample weighing 0.389 g is collected in a flask with a volume of 102 cm³ at 97°C and at a pressure of 728 mmHg? (R = 0.08206 L • atm/K • mol, 1 atm = 760 mmHg) .

Explain why you do not feel atmospheric pressure pushing on your body.

A sample of N₂ gas occupies 2.40 L at 20°C. At what temperature will the N₂ gas occupy a volume of 4.80 L at constant pressure?

A 3.0-L sample of helium was placed in container fitted with a porous membrane. Half of the helium effused through the membrane in 24 hours. A 3.0-L sample of oxygen was placed in an identical container. How many hours will it take for half of the oxygen to effuse through the membrane?

_______ ________ is theoretically the lowest attainable temperature.

What is the formula which describes the relationship between the volume and temperature at constant pressure and constant number of moles?

Freon-12, CF₂Cl₂, which has been widely used in air conditioning systems, is considered a threat to the ozone layer in the stratosphere. Calculate the root-mean-square velocity of Freon-12 molecules in the lower stratosphere where the temperature is -65°C.

What are the units of the constant a in the van der Waals equation?

Nitrogen will behave most like an ideal gas

What is the pressure in atmospheres exerted by a column of water that is 12.5 m high? (density of water = 1.00g/cm³; gravitational constant = 9.80665 m/s², 1 atm = 101,325 Pa = 760 torr = 760 mmHg)

If the atmospheric pressure in Denver is 0.8800 atm, what is this pressure expressed in mmHg? (1 atm = 101,325 Pa = 760 torr, 1 torr = 1 mmHg) ?

Which gas has molecules with the greatest average molecular speed at 25°C?

A 250.0-mL sample of ammonia, NH₃(g) , exerts a pressure of 833 torr at 42.4°C. What mass of ammonia is in the container? (R = 0.08206 L • atm/K • mol, 1 atm = 760 torr)

A flask containing argon gas is connected to a closed-ended mercury manometer. The closed end is under vacuum. If the mercury level in the closed arm is 230. mm above that in the arm connected to the flask, what is the argon pressure, in torr?

What is the temperature in Celsius at 4 K, which is the normal boiling point of liquid helium?

At a temperature of absolute zero, the volume of an ideal gas is zero.

Calculate the root-mean-square speed of methane, CH₄(g) , at 78°C.