Chapter 5 Worksheet

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MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

1) A gas occupies 3.33 L at 2.23 atm. What is the volume at 2.50 atm?A) 0.268 L B) 18.6 L C) 3.73 L D) 1.67 L E) 2.97 L

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2) If a sample of 0.29 moles of Ar occupies 3.8 L under certain conditions, what volume will 0.66moles occupy under the same conditions?A) 12 L B) 8.6 L C) 17 L D) 15 L E) 5.0 L

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3) A sample of 0.300 moles of nitrogen occupies 0.600 L. Under the same conditions, what numberof moles occupies 1.200 L?A) 6.00 moles B) 0.33 moles C) 0.600 moles D) 1.50 moles

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4) 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) 9.74 L B) 5.58 L C) 17.9 L D) 10.3 L E) 4.38 L

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5) Calculate the temperature, in K, of 2.20 moles of gas occupying 3.50 L at 3.30 atm.A) 28.0 K B) 64.0 K C) 337 K D) 5.25 K

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6) What pressure will 14.0 g of CO exert in a 3.5 L container at 75°C?A) 4.1 atm B) 6.4 atm C) 5.0 atm D) 2.3 atm E) 1.1 atm

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7) Which of the following samples will have the lowest pressure if they are all at the sametemperature and in identical containers (same volume)?A) 15 g F2B) 15 g NeC) 15 g CO2D) 15 g KrE) All of these samples will have the same pressure.

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8) Which of the following samples has the greatest density at STP?A) NO2B) SO2C) XeD) SF6E) All of these samples have the same density at STP.

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9) Using the graph below, determine the gas that has the lowest density at STP.

A) CB) AC) DD) BE) All of the gases have the same density at STP.

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10) What volume will 0.780 moles of He occupy at STP?A) 15.6 L B) 17.5 L C) 70.0 L D) 43.7 atm E) 22.4 L

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11) A mixture of N2, O2 and Ar have mole fractions of 0.25, 0.65, and 0.10, respectively. What is thepressure of N2 if the total pressure of the mixture is 3.9 atm?A) 0.98 atm B) 2.5 atm C) 0.39 atm D) 0.67 atm E) 1.33 atm

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12) The following reaction is used to generate hydrogen gas in the laboratory. If 243 mL of gas iscollected at 25 °C and has a total pressure of 745 mm Hg, what mass of hydrogen is produced? Apossibly useful table of water vapor pressures is provided below.

Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g) T (°C) P (mm Hg) 20 17.55 25 23.7830 31.86

A) 0.0449 g H2B) 0.0717 g H2C) 0.0196 g H2D) 0.0144 g H2E) 0.0190 g H2

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13) Determine the volume of O2 (at STP) formed when 50.0 g of KClO3 decomposes according tothe following reaction. The molar mass for KClO3 is 122.55 g/mol.

2 KClO3(s) → 2 KCl(s) + 3 O2(g)

A) 8.22 L B) 14.6 L C) 12.3 L D) 13.7 L E) 9.14 L

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14) What pressure would a gas mixture in a 10.0 L tank exert if it were composed of 48.5 g He and94.6 g CO2 at 398 K?A) 39.6 atm B) 7.02 atm C) 58.7 atm D) 32.6 atm E) 46.6 atm

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15) How many molecules of XeF6 are formed from 12.9 L of F2 (at 298 K and 2.60 atm) according tothe following reaction? Assume that there is excess Xe.

Xe(g) + 3 F2(g) → XeF6(g)

A) 2.75 × 1023 molecules XeF6B) 1.21 × 1023 molecules XeF6C) 1.37 × 1023 molecules XeF6D) 7.29 × 1023 molecules XeF6E) 8.25 × 1023 molecules XeF6

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16) Determine the volume of SO2 (at STP) formed from the reaction of 96.7 g of FeS2 and 55.0 L ofO2 (at 398 K and 1.20 atm). The molar mass of FeS2 is 119.99 g/mol.

4 FeS2(s) + 11 O2(g) → 2 Fe2O3(s) + 8 SO2(g)

A) 36.1 L B) 32.9 L C) 18.1 L D) 27.6 L E) 45.3 L

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17) Determine the total volume of all gases (at STP) formed when 50.0 mL of TNT (C3H5(NO3)3 , d= 1.60 g/mL, molar mass = 227.10 g/mol) reacts according to the following reaction.

4 C3H5(NO3)3(l) → 6 N2(g) + O2(g) + 12 CO2(g) + 10 H2O(g)

A) 4.93 L B) 175 L C) 57.2 L D) 29.6 L E) 448 L

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18) Identify the gas particle that travels the fastest.A) Ne B) CO C) N2 D) O2 E) H2

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19) Identify the gas particle that travels the slowest.A) N2 B) O2 C) H2 D) CO E) Ne

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20) Rank the following in order of decreasing rate of effusion.

F2 SF6 CO Kr

A) Kr > CO > SF6 > F2B) CO > F2 > Kr > SF6C) F2 > Kr > CO > SF6D) SF6 > Kr > F2 > COE) CO > F2 > SF6 > Kr

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21) The rate of effusion of oxygen to an unknown gas is 0.935. What is the other gas?A) F2 B) Ar C) N2 D) Ne

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22) A sample of N2 effuses in 255 s. How long will the same size sample of Cl2 take to effuse?A) 155 s B) 406 s C) 645 s D) 388 s E) 247 s

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23) What is the pressure in a gas container that is connected to an open-end U-tube manometer ifthe pressure of the atmosphere is 742 torr and the level of mercury in the arm connected to thecontainer is 8.60 cm higher than the level of mercury open to the atmosphere?A) 751 mm Hg B) 733 mm Hg C) 656 mm Hg D) 828 mm Hg

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24) If the pressure in a gas container that is connected to an open-end U-tube manometer is 116 kPaand the pressure of the atmosphere at the open end of the tube is 752 mm Hg, the level ofmercury in the tube willA) be 870 mm higher in the arm open to the atmosphere.B) be 118 mm higher in the arm open to the atmosphere.C) be 870 mm higher in the arm connected to the gas cylinder.D) be 118 mm higher in the arm connected to the gas cylinder.

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25) A balloon filled with helium gas at 20°C occupies 4.91 L at 1.00 atm. The balloon is immersed inliquid nitrogen at -196°C, while the pressure is raised to 5.20 atm. What is the volume of theballoon in the liquid nitrogen?A) 97 L B) 6.7 L C) 3.6 L D) 0.25 L

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26) A 45.0-L steel tank at 20.0°C contains acetylene gas, C2H2, at a pressure of 1.39 atm. Assumingideal behavior, how many grams of acetylene are in the tank?A) 990 g B) 2.60 g C) 67.8 g D) 10.0 g

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27) Three identical flasks contain three different gases at standard temperature and pressure. FlaskA contains C2H4, flask B contains O3, and flask C contains F2. Which flask contains the largestnumber of molecules?A) flask A B) flask BC) flask C D) All contain same number of molecules.

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28) The density of nitric oxide (NO) gas at 1.21 atm and 54.1°C is __________ g/L.A) 0.273 B) 0.0451 C) 1.35 D) 0.740 E) 8.2

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29) What is the density of hydrogen gas at STP?A) 0.0823 g/L B) 0.0899 g/L C) 11.1 g/L D) 0.0450 g/L

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30) Which of the following would have a density of 1.37 g/L at 7.0°C and 0.987 atm?A) N2 B) Kr C) Rn D) O2

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Answer KeyTestname: UNTITLED1

1) E2) B3) C4) B5) B6) A7) D8) D9) B10) B11) A12) E13) D14) E15) A16) B17) C18) E19) D20) B21) C22) B23) C24) B25) D26) C27) D28) C29) B30) D

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