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Unformatted text preview: Exam Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) What volume (in mL) will a sample of F2 gas occupy in a syringe at 5.5 atm, if the F2 has a 1)
volume of 25.0 mL at 1.2 atm?
A) 5.5 mL B) 17 mL C) 11 mL D) 3.8 mL E) 7.6 mL
2) What temperature must a balloon, initially at 25 ° C and 2.00 L, be heated in order to have a 2)
volume of 6.00 L?
A) 403 K B) 655 K C) 993 K D) 894 K E) 75 K 3) A large balloon is initially filled to a volume of 25.0 L at 353 K and a pressure of 2575 mm Hg. 3)
What volume of gas will the balloon contain at 1.35 atm and 253 K?
A) 11.4 L B) 45.0 L C) 87.5 L D) 22.2 L E) 58.6 L 4) A syringe initially holds a sample of gas with a volume of 285 mL at 355 K and 1.88 atm. To 4)
what temperature must the gas in the syringe be heated/cooled in order to have a volume of 435 mL at 2.50 atm?
A) 466 K B) 139 K C) 721 K D) 572 K E) 175 K 5) A 0.334 g sample of an unknown halogen occupies 109 mL at 398 K and 1.41 atm. What is the 5)
identity of the halogen?
A) F2 B) Ge C) 12 D) C12 E) B12 6) A mixture of 0.220 moles CO, 0.350 moles H2 and 0.640 moles He has a total pressure of 2.95 6) atm. What is the pressure of CO?
A) 0.649 atm B) 0.536 atm C) 1.86 atm D) 1.54 atm E) 0.955 atm 7) A mixture of He, Ne and Ar has a pressure of 7.85 atm. If the Ne has a mole fraction of 0.47 7) and Ar has a mole fraction of 0.23, what is the pressure of He?
A) 5.5 atm B) 4.2 atm C) 3.7 atm D) 1.8 atm E) 2.4 atm 8) Determine the volume of 02 (at STP) formed when 50.0 g of KClO3 decomposes according to 8)
the following reaction. The molar mass for KClO3 is 122.55 g/mol. 2 KClO3(s) —> 2 KC1(s) + 3 02(g) A) 14.6 L B) 8.22 L C) 12.3 L D) 13.7 L E) 9.14 L ' 9) Determine the mass of water formed when 12.5 L NH3 (at 298 K and 1.5 atm) is reacted with
18.9 L of 02 (at 323 K and 1.1 atm). 4 NH3(g) + 5 02(g) —> 4 NO(g) + 6 H20(g) A) 27.9 g H20
B) 37.7 g H20
C) 13.8 g H20
D) 20.7 g H20
E) 17.0 g H20 10) A 0.465 g sample of an unknown compound occupies 245 mL at 298 K and 1.22 atm. What is
the molar mas s of the unknown compound? .
A) 81.8 g/mol B) 38.0 g/mol C) 33.9 g/mol D) 12.2 g/mol E) 26.3 g/mol 11) Determine the density of NH3 gas at 435 K and 1.00 atm.
A) 0.477 g/L B) 2.24 g/L C) 2.10 g/L D) 0.851 g/L E) 0.321 g/L 12) Determine the density of C02 gas at STP.
A) 1.80 g/L B) 2.24 g/L C) 4.46 g/L D) 5.10 g/L E) 1.96 g/L 13) A sample of gas initially has a volume of 859 mL at 565 K and 2.20 atm. What pressure will
the sample have if the volume changes to 268 mL while the temperature is increased to 815 K?
A) 10.2 atm B) 1.05 atm C) 6.53 atm D) 9.83 atm E) 15.3 atm 14) To what volume will a sample of gas expand if it is heated from 50.0 ° C and 2.33 L to 500.0°C?
A) 4.38 L B) 9.74 L C) 17.9 L D) 5.58 L E) 10.3 L 15) A mixture of 0.220 moles CO, 0.350 moles H2 and 0.640 moles He has a total pressure of 2.95 atm. What is the pressure of H2?
A) 0.969 atm B) 1.17 atm C) 0.649 atm D) 0.853 atm E) 1.03 atm 16) A mixture of N2, 02 and Ar have mole fractions of 0.25, 0.65, and 0.10, respectively. What is
the pressure of N2 if the total pressure of the mixture is 3.9 atm?
A) 0.67 atm B) 2.5 atm C) 1.33 atm D) 0.39 atm E) 0.98 atm 17) A mixture of 10.0 g of Ne and 10.0 g Ar have a total pressure of 1.6 atm. What is the partial pressure of Ne?
A) 0.40 atm B) 1.1 atm C) 1.3 atm D) 080 atm E) 0.54 atm 18) Determine the volume of 502 (at STP) formed from the reaction of 96.7 g of FeSz and 55.0 L of
02 (at 398 K and 1.20 atm). The molar mass of Fe52 is 119.99 g/mol. 4 FeSz(s) + 11 02(g) —> 2 Fe203(s) + 8 S02(g) A) 27.6 L B) 45.3 L C) 32.9 L D) 36.1 L E) 18.1 L 9) 10) 11) 12) 13) 14) 15) 16) 17) 18) 19) Determine the theoretical yield and the percent yield if 21.8 g of K2C03 is produced from 19)
reacting 27.9 g K02 with 29.0 L of C02 (at STP). The molar mass of K02 = 71.10 g/rnol and
K2C03 = 138.21 g/mol. 4 K02(S) + 2 c02(g) > 2 K2C03(S) + 3 02(g) A) 91.7 g, 23.8 % yield
B) 61.0 g, 35.7 % yield
C) 179 g, 12.2 % yield
D) 27.1 g, 80.4 % yield
E) 206 g, 10.6 % yield 20) How many molecules of XeF6 are formed from 12.9 L of F2 (at 298 K and 2.6 atm) according to 20)
the following reaction? Assume that there is excess Xe. Xe(g) + 3 F2(g) —> XeF6(g) A) 8.25 x 1023 molecules XeF6
B) 7.29 x 1023 molecules XeF6
C) 1.37 x 1023 molecules XeF6
D) 1.21 x 1023 molecules XeF6
E) 2.75 x 1023 molecules XeF6 Answer Key
Testname: 1027 TRO CHAPTER 11 GASES 1) A
2) D
3) B
4) C
5) D
6) B
7) E
8) D
9) E
10) B
11) A
12) E
13) A
14) D
15) D
16) E
17) B
18) C
19) D
20) E ...
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 Spring '11
 THOMAS
 Chemistry

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