I. Multiple Choice Questions - Choose the best answer for each question.
1.) A 15.0 liter gas
sample is heated from 29 oC to 67 oC 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 CO2
gas occupies 3.0 L at 35 oC and 1.0 atm. What is the new volume if
the temperature and pressure are changed to 48 oC 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 oC has its
temperature increased to 50.0 oC, what is
(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) P1 V1 = P2 V2 (B) P1 = P2 (C) P1 + V1 = (D) P V = n R T
V1 V2 P2 + V2
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 oC has its
pressure decreased to 2.4 atm, what is the new
temperature of the gas?
(A) 147 K (B) 254 K (C) 147 oC (D) 254 oC (E) 28 oC
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 N2 gas at a pressure of 3.00 atm and 250 oC.
is the volume of the container that is used to hold the same gas at STP (standard
temperature and pressure)?
2.) What volume of N2
gas at 0.947 atm and 23 oC
is required to react with 7.35 liters of H2
gas at the same temperature and pressure? N2 + H2 --> NH3
3.) How many liters
of O2 gas at STP are evolved when 3.25 grams of KNO3
KNO2 and O2? KNO3 --> KNO2 + O2
4.) What is the volume of 0.55 moles of an ideal gas that is at 1.03 atm and 94 oC?
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?
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 oC. What is the molar mass of the gas?
b.) Later, it is revealed
that the unknown gas is propane (C3H8). What is the