`CHEM 1305- Home-work 10 NAME:
1) Indicate the missing words in the following statement: “Gas laws describe in mathematical terms the relationships between the variables pressure, ________ and ________ for a fixed quantity of gas.”
A) temperature; chemical identity
B) temperature; volume
C) volume; chemical identity
D) chemical identity; cost
E) mass; density
2) The barometric pressure in the eye of a hurricane sometimes dips as low as 27.2 inches mercury. How many millimeters of mercury is this? (760 mmHg = 29.9inHg)
A) 1.1 mmHg B) 6.9 mmHg C) 691 mmHg D) 107 mmHg
3) 8.00 liters of oxygen gas is under a pressure of 280 torr. If the volume of this gas is increased to
14.00 liters at constant temperature, what will the new pressure be?
A) 66 torr B) 490 torr C) 211 torr D) 387 torr E) 160 torr
4) A balloon originally had a volume of 4.39 L at 44 o C and a pressure of 729 torr. To what temperature
(in o C) must the balloon be cooled to reduce its volume to 3.78 L if the pressure is constant?
A) 38 o C B) 0 o C C) 72.9 o C D) 273 o C
5) If the volume of a sample of chlorine gas is reduced by 1/3 at constant pressure, what happens to its absolute temperature?
A) It remains constant. B) It decreases by 1/3. C) It triples.
D) It increases nine-fold. E) It increases by a factor of 9.
6) A cylinder of oxygen gas has a pressure of 6.00 atm at 25.0

C. What is the pressure of the gas at 0.0

C?
A) 6.55 atm B) 2.40 atm C) 15.0 atm D) 38.9 atm E) 5.50 atm
7) How will the pressure of a fixed sample of gas change if its volume is halved and its temperature is
quadrupled (moles of gas remain constant)?
A) The pressure will decrease by a factor of 4.
B) The pressure will increase by a factor of 4.
C) The pressure will quadruple.
D) The pressure will decrease by a factor of 8.
E) The pressure will increase by a factor of 8.
8) The conditions known as STP are ________.
A) 760 atm and 273 K B) 760 mm Hg and 273

C C) 1 atm and 273 K
D) 1 mm Hg and 273 K E) 22.4 mol and 760 mm Hg
9) A sample of nitrogen gas occupies a volume of 8.65 L at a temperature of 295 K and a pressure of
0.985 atm. What is the pressure of the gas if the volume of the gas is increased to 12.1 L and the
temperature is reduced to 284 K?
A) 1.08 atm B) 0.875 atm C) 0.678 atm D) 0.743 atm E) 1.39 atm
10) A sample of N
2
gas occupies a volume 180 mL at STP. What volume, in L, will it occupy at 640 mm
Hg and 295 K?

A) 0.749 L B) 0.690 L C) 1.07 L D) 1.45 L E) 0.231 L
11) What volume of H
2
gas at 780 mm Hg and 23

C is required to produce 10.6 L of NH
3
gas at the same
temperature and pressure using the following chemical reaction?
N
2
(g)

3H
2
(g)

2NH
3
(g)
A) 10.0 L B) 15.0 L C) 20.0 L D) 13.0 L E) 15.9 L
12) At standard conditions, one mole of any gas (molar volume) will occupy a volume of ________.
A) 1.00 liter B) 22.41 mL C) 22.41 L D) 22,400 L E) 760 mL
13) The temperature, in

C, occupied by 0.643 moles of O
2
gas at 0.893 atm pressure and a volume of 14.7
L is ________.
A) 16

C B)

24

C C) 48

C D) 318

C E) 249

C
14) Calculate the volume of 12.0 g of helium at 54.5

C and 1025 mm Hg.
A) 59.8 L B) 13.9 L C) 24.6 L D) 77.4 L E) 98.8 L
15) At what temperature in o C does 0.444 mole of carbon monoxide, CO, occupy 11.8 L at 889 mmHg?
A) 51 o C B) 14 o C C) 32 o C D) 106 o C