Multiple
Choice
Identify the letter of the choice that best completes the statement or answers the
question.
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1.
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Avogadro's hypothesis states
that equal volumes of gases under the same conditions of temperature and pressure have equal
____. a. | densities | b. | particle
velocities | c. | molar masses | d. | numbers of particles | e. | masses | | |
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2.
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Calculate the density (in g/L)
of Kr at 308 K and 527 mm Hg. (R = 0.082057 L·atm/mol·K) a. | 2.30 g/L | b. | 4.78 g/L | c. | 31.1 g/L | d. | 1.75 ×
103 g/L | e. | 2.36 ×
104 g/L | | |
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3.
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If the density of oxygen in air
is 0.263 g/L at 25 °C, what is the pressure of oxygen at 25
°C? (R = 0.082057 L·atm/mol·K) a. | 0.201 atm | b. | 0.344 atm | c. | 0.402 atm | d. | 2.91 atm | e. | 6.43 atm | | |
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4.
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At what temperature does 1.00
atm of Ar gas have the same density as 1.00 atm of He gas at 273.2 K? a. | 27.4 K | b. | 117 K | c. | 367 K | d. | 2.73 ×
103 K | e. | 4.71 ×
103 K | | |
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5.
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What volume of O2,
measured at 91.2 °C and 743 mm Hg, will be produced by the
decomposition of 4.88 g KClO3? (R = 0.082057
L·atm/mol·K)
2 KClO3(s) → 2
KCl(s) + 3 O2(g)
a. | 0.305 L | b. | 1.22 L | c. | 1.83 L | d. | 24.0 L | e. | 37.4 L | | |
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6.
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What volume of
O2(g), measured at 17.7 °C and
0.978 atm reacts with 15.1 g C4H10 to produce CO2(g) and
H2O(λ)? (R = 0.082057
L·atm/mol·K) a. | 2.51 L | b. | 6.34 L | c. | 23.5 L | d. | 41.2 L | e. | 239 L | | |
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7.
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Ammonia gas is synthesized
according to the balanced equation below.
N2(g) + 3 H2(g) → 2 NH3(g)
If 2.75 L N2 react with 7.75 L H2, what is the
theoretical yield (in liters) of NH3? Assume that the volumes of reactants and products
are measured at the same temperature and pressure. a. | 2.75 L | b. | 5.17 L | c. | 5.50 L | d. | 10.5 L | e. | 15.5 L | | |
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8.
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Nitroglycerin (227.1 g/mol)
decomposes according to the reaction below.
4 C3H5N3O9(l) → 6 N2(g) + 12 CO2(g)
+ 10 H2O(g) + O2(g)
What total volume of gases is produced at 65 °C and 744 mm Hg by the decomposition of 5.00 g nitroglycerin? (R = 0.082057
L·atm/mol·K) a. | 5.95 ×
10-3 L | b. | 0.120 L | c. | 0.624 | d. | 4.52 L | e. | 18.1 L | | |
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9.
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Place the following gases in
order of increasing average velocity at 325 K: Ar, Ne, N2, and
SO2. a. | Ar < Ne < N2 <
SO2 | b. | Ne < Ar < N2 <
SO2 | c. | N2 < SO2 < Ne <
Ar | d. | SO2 < Ar < N2 <
Ne | e. | Ar = Ne = N2 = SO2 | | |
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10.
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The average velocity of a gas
molecule is a. | inversely proportional to its kinetic
energy. | b. | directly proportional to the gas constant,
R. | c. | directly proportional to the square root of its temperature in
K. | d. | inversely proportional to the square of its
mass. | e. | directly proportional to the square root of its
mass. | | |
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