Chapter 10 MULTIPLE CHOICE. Choose the one alternative ...

Chapter 10

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

1) A gas at a pressure of 10.0 Pa exerts a force of __________ N on an area of 5.5 m2.

1)

A) 1.8

B) 0.55

C) 5.5

D) 55

E) 18

2) A gas at a pressure of 325 torr exerts a force of __________ N on an area of 5.5 m2.

2)

A) 0.018

B) 2.4

C) 2.4 ? 105

D) 59

E) 1.8 ? 103

3) A pressure of 1.00 atm is the same as a pressure of __________ of mmHg.

A) 193

B) 33.0

C) 29.92

D) 101

3) E) 760.0

4) The National Weather Service routinely supplies atmospheric pressure data to help pilots set their 4) altimeters. The units the NWS uses for atmospheric pressure are inches of mercury. A barometric pressure of 30.51 inches of mercury corresponds to __________ kPa.

A) 16.01

B) 775

C) 103.3

D) 77.50

E) 1.020

5) A closed-end manometer was attached to a vessel containing argon. The difference in the mercury 5) levels in the two arms of the manometer was 12.2 cm. Atmospheric pressure was 783 mmHg. The pressure of the argon in the container was __________ mmHg.

A) 795

B) 122

C) 882

D) 661

E) 771

6) A gas vessel is attached to an open-end manometer containing a nonvolatile liquid of density 0.791 6) g/mL as shown below.

The difference in heights of the liquid in the two sides of the manometer is 43.4 cm when the atmospheric pressure is 755 mmHg. Given that the density of mercury is 13.6 g/mL, the pressure of the enclosed gas is __________ atm.

A) 0.993

B) 1.03

C) 0.987

D) 0.960

E) 0.990

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7) A gas vessel is attached to an open-end manometer filled with a nonvolatile liquid of density 0.993 7) g/mL as shown below.

The difference in heights of the liquid in the two sides of the manometer is 32.3 cm when the atmospheric pressure is 765 mmHg. Given that the density of mercury is 13.6 g/mL, the pressure of the enclosed gas is __________ atm.

A) 0.993

B) 1.04

C) 1.08

D) 1.01

E) 0.976

8) In a Torricelli barometer, a pressure of one atmosphere supports a 760 mm column of mercury. If 8) the original tube containing the mercury is replaced with a tube having twice the diameter of the original, the height of the mercury column at one atmosphere pressure is __________ mm.

A) 4.78 ? 103

B) 760

C) 121

D) 380

E) 1.52 ? 103

9) A sample of gas (24.2 g) initially at 4.00 atm was compressed from 8.00 L to 2.00 L at constant

9)

temperature. After the compression, the gas pressure was __________ atm.

A) 1.00

B) 16.0

C) 2.00

D) 4.00

E) 8.00

10) A sample of a gas (5.0 mol) at 1.0 atm is expanded at constant temperature from 10 L to 15 L. The 10) final pressure is __________ atm.

A) 7.5

B) 3.3

C) 15

D) 1.5

E) 0.67

11) A balloon originally had a volume of 4.39 L at 44 ?C and a pressure of 729 torr. The balloon must 11) be cooled to __________?C to reduce its volume to 3.78 L (at constant pressure).

A) 38

B) 0

C) 273

D) 546

E) 72.9

12) If 3.21 mol of a gas occupies 56.2 L at 44 ?C and 793 torr, 5.29 mol of this gas occupies __________ L 12) under these conditions.

A) 30.9

B) 478

C) 61.7

D) 92.6

E) 14.7

13) A gas originally at 27 ?C and 1.00 atm pressure in a 3.9 L flask is cooled at constant pressure until 13) the temperature is 11 ?C. The new volume of the gas is __________ L.

A) 3.7

B) 0.27

C) 3.9

D) 4.1

E) 0.24

14) If 50.75 g of a gas occupies 10.0 L at STP, 129.3 g of the gas will occupy __________ L at STP.

14)

A) 50.8

B) 3.92

C) 5.08

D) 25.5

E) 12.9

2

15) A sample of He gas (2.35 mol) occupies 57.9 L at 300.0 K and 1.00 atm. The volume of this sample 15) is __________ L at 423 K and 1.00 atm.

A) 0.709

B) 81.6

C) 41.1

D) 57.9

E) 1.41

16) A sample of H2 gas (12.28 g) occupies 100.0 L at 400.0 K and 2.00 atm. A sample weighing 9.49 g

16)

occupies __________ L at 353 K and 2.00 atm.

A) 109

B) 147

C) 68.2

D) 77.3

E) 54.7

17) A sample of an ideal gas (3.00 L) in a closed container at 25.0 ?C and 76.0 torr is heated to 300 ?C.

17)

The pressure of the gas at this temperature is __________ torr.

A) 76.5

B) 39.5 C) 2.53 ? 10-2

D) 912

E) 146

18) A sample of a gas (1.50 mol) is contained in a 15.0 L cylinder. The temperature is increased from

18)

100 ?C to 150 ?C.

The

ratio

of

final

pressure

to

initial

pressure

[

P2 P1

]

is

__________.

A) 1.00

B) 1.50

C) 0.882

D) 1.13

E) 0.667

19) A sample of a gas originally at 25 ?C and 1.00 atm pressure in a 2.5 L container is allowed to expand 19) until the pressure is 0.85 atm and the temperature is 15 ?C. The final volume of the gas is __________ L.

A) 2.8

B) 3.0

C) 2.6

D) 2.1

E) 0.38

20) The reaction of 50 mL of Cl2 gas with 50 mL of CH4 gas via the equation:

20)

Cl2 (g) + CH4 (g) HCl (g) + CH3Cl (g)

will produce a total of __________ mL of products if pressure and temperature are kept constant.

A) 250

B) 50

C) 200

D) 150

E) 100

21) The reaction of 50 mL of N2 gas with 150 mL of H2 gas to form ammonia via the equation:

21)

N2 (g) + 3H2 (g) 2NH3 (g)

will produce __________ mL of ammonia if pressure and temperature are kept constant.

A) 100

B) 250

C) 150

D) 200

E) 50

22) The reaction of 50 mL of Cl2 gas with 50 mL of CH4 gas via the equation:

22)

Cl2 (g) + C2H4 (g) C2H4Cl2 (g)

will produce a total of __________ mL of products if pressure and temperature are kept constant.

A) 25

B) 50

C) 100

D) 150

E) 125

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23) The amount of gas that occupies 60.82 L at 31 ?C and 367 mmHg is __________ mol.

23)

A) 11.6

B) 1.18

C) 0.850

D) 894

E) 0.120

24) The pressure of a sample of CH4 gas (6.022 g) in a 30.0 L vessel at 402 K is __________ atm.

24)

A) 12.4

B) 6.62

C) 2.42

D) 0.414

E) 22.4

25) At a temperature of __________ ?C, 0.444 mol of CO gas occupies 11.8 L at 889 torr.

25)

A) 106

B) 379

C) 32

D) 73

E) 14

26) The volume of 0.25 mol of a gas at 72.7 kPa and 15 ?C is __________ m3.

A) 2.2 ? 10-1

B) 8.1 ? 10-5

C) 4.3 ? 10-4

D) 1.2 ? 10-4

26) E) 8.2 ? 10-3

27) The pressure exerted by 1.3 mol of gas in a 13 L flask at 22 ?C is __________ kPa.

27)

A) 18

B) 560

C) 2.4

D) 1.0

E) 250

28) A 0.325 L flask filled with gas at 0.914 atm and 19 ?C contains __________ mol of gas.

28)

A) 80.7

B) 12.4 C) 1.48 ? 10-2

D) 9.42 E) 1.24 ? 10-2

29) A gas in a 325 mL container has a pressure of 695 torr at 19 ?C. There are __________ mol of gas in 29) the flask.

A) 12.4 B) 1.24 ? 10-2 C) 1.48 ? 10-2

D) 9.42

E) 80.6

30) A sample of gas (1.9 mol) is in a flask at 21 ?C and 697 mmHg. The flask is opened and more gas is 30) added to the flask. The new pressure is 795 mmHg and the temperature is now 26 ?C. There are now __________ mol of gas in the flask.

A) 0.28

B) 2.1

C) 1.6

D) 3.5

E) 2.9

31) A sample of gas (1.3 mol) occupies __________ L at 22 ?C and 2.5 atm.

A) 0.94

B) 3.2 ? 10-2

C) 13

D) 31

31) E) 0.079

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32) The volume of 0.65 mol of an ideal gas at 365 torr and 97 ?C is __________ L.

32)

A) 0.054

B) 9.5

C) 2.4 ? 10-2

D) 11

E) 41

33) The volume occupied by 1.5 mol of gas at 35 ?C and 2.0 atm pressure is __________ L.

33)

A) 2.2

B) 38

C) 0.026

D) 0.053

E) 19

34) The mass of nitrogen dioxide contained in a 4.32 L vessel at 48 ?C and 141600 Pa is __________ g.

34)

A) 5.35 ? 104

B) 9.46 ? 10-2

C) 10.5

D) 70.5

E) 53.5

35) The density of ammonia gas in a 4.32 L container at 837 torr and 45.0 ?C is __________ g/L.

35)

A) 3.86 B) 4.22 ? 10-2

C) 0.717

D) 0.432

E) 0.194

36) The density of N2O at 1.53 atm and 45.2 ?C is __________ g/L.

A) 0.388

B) 2.58

C) 9.99

D) 1.76

36) E) 18.2

37) The molecular weight of a gas is __________ g/mol if 3.5 g of the gas occupies 2.1 L at STP.

37)

A) 4.6 ? 102

B) 5.5 ? 103

C) 41

D) 2.7 ? 10-2

E) 37

38) The molecular weight of a gas that has a density of 6.70 g/L at STP is __________ g/mol.

38)

A) 150

B) 3.35

C) 73.0

D) 496

E) 0.298

39) The molecular weight of a gas that has a density of 7.10 g/L at 25.0 ?C and 1.00 atm pressure is

39)

__________ g/mol.

A) 28.0 B) 5.75 ? 10-3

C) 14.6 D) 6.85 ? 10-2

E) 174

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