I. Multiple Choice
Questions - Choose the best answer for each question.

1.) A 15.0 liter gas
sample is heated from 29 ^{o}C to 67 ^{o}C at constant pressure conditions.

Under these conditions, which of the following
statements is correct?

(A) the
number of moles of gas increases

(B) the
number of moles of gas decreases

(C) the
volume decreases

(D) the
volume increases

(E) none of
the above are correct

2.) A sample of CO_{2}
gas occupies 3.0 L at 35 ^{o}C and 1.0 atm. What is the new volume if

the temperature and pressure are changed to 48 ^{o}C and 1.5 atm?

(A) 3.0
L (B) 1.9
L (C) 4.7
L (D) 4.3
L (E) 2.1 L

3.) If 10.7 liters
of a gas^{ }at 35.0 ^{o}C has its
temperature increased to 50.0 ^{o}C, what is
the

new volume?

(A) 7.3
L (B) 10.2
L (C) 11.2
L (D) 15.9 L

4.) In the ideal gas
equation, the ideal gas constant (R) is equal to

(A) __n T __
(B) __P V __
(C) __P V T __ (D) __
n __ (E) __
V T __

P
V
n T
n
P V
T
n P

5.) Boyle's Law
relates pressure and volume. What is the equation for Boyle's Law?

(A) P_{1}
V_{1} = P_{2} V_{2}
(B) __P___{1}__ __= __P___{2}__ __
(C) P_{1} + V_{1}
= (D) P V = n R T

V_{1} V_{2}
P_{2} + V_{2}

6.) If 0.50 moles of
helium are placed inside a 1.50 L container at 77 K, what is the pressure

exerted by the helium gas?

(A) 0.48 atm
(B) 1.2 atm
(C) 2.1 atm

(D) 3.7 atm
(E) 4.5 atm

7.) In order to
solve a problem using the ideal gas equation, how many values must be given

to solve the problem?

(A)
1 (B)
2 (C)
3 (D)
4 (E) 5

8.) Which of the
following is/are constant in the equation for Boyle's Law?

(I)
Pressure (II)
Volume (III)
Moles (IV)
Temperature

(A) I
only
(B) II and III only
(C) I and IV only

(D) I, II,
and IV only (E) III and IV only

9.) If a gas at 2.9 atm and 34 ^{o}C has its
pressure decreased to 2.4 atm, what is the new

temperature of the gas?

(A) 147
K (B) 254
K (C) 147 ^{o}C
(D) 254 ^{o}C
(E) 28 ^{o}C

10.) How do you
convert from degrees Celsius to Kelvins?

(A) add
100 (B)
subtract 173
(C) subtract 273

(D) subtract
100 (E) add 273

11.) The quantity of
a gas is measured in

(A) Kelvins
(B) Liters
(C)
Atmospheres
(D) Moles

12.) The average
kinetic energy of the molecules of a gas is determined by the __ of the gas.

(A) quantity
(B) mass (C)
pressure

(D)
temperature (E) volume

II.
Solve each of the following problems. (You must show your work!)

1.) A 5.00 liter
container is filled with N_{2} gas at a pressure of 3.00 atm and 250 ^{o}C.
What

is the volume of the container that is used to
hold the same gas at STP (standard

temperature and pressure)?

2.) What volume of N_{2}
gas at 0.947 atm and 23 ^{o}C
is required to react with 7.35 liters of H_{2}

gas at the same temperature and
pressure? N_{2} + H_{2}
--> NH_{3}

3.) How many liters
of O_{2} gas at STP are evolved when 3.25 grams of KNO_{3}
decomposes to

KNO_{2} and O_{2}?
KNO_{3} --> KNO_{2}
+ O_{2}

4.) What is the
volume of 0.55 moles of an ideal gas that is at 1.03 atm
and 94 ^{o}C?

5.) If a gas has an
initial pressure of 1.45 atm and an initial volume of
23.0 liters, what is its

final volume if the pressure is increased to
2.43 atm?

6.)
a.) In an experiment, a student is to determine the molar mass of
an unknown gas.

During the
experiment, the student measures the following data:

The mass of
the gas is 0.65 grams. The pressure is 1.07 atm.
The volume is

350 mL. The temperature is 21.5 ^{o}C.
What is the molar mass of the gas?

b.) Later, it is revealed
that the unknown gas is propane (C_{3}H_{8}). What is the
student's

percent
error?

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