A) 96.7 L B) 8.54 × 10-4 L C) 9.58 L D) 421 L E) 2.20 L 42) If a 0.614 g sample

Question

A) 96.7 L

B) 8.54 × 10-4 L

C) 9.58 L

D) 421 L

E) 2.20 L

42) If a 0.614 g sample of a gas maintains a pressure of 238 mmHg when contained in a 1.0 L flask at

0.0°C, what is the gas's molecular weight?

A) 5 g/mol

B) 120 g/mol

C) 44 g/mol

D) 8.8 g/mol

E) 22 g/mol

43) What volume will be occupied by 8.00 g of oxygen, O2,at STP?

A) 11.2 L

B) 5.60 L

C) 22.4 L

D) 4.00 L

E) 13.4 L

44) What is the total pressure of a mixture of He and H2 if thepartial pressures are 320 mm Hg and

800 mm Hg respectively?

A) 320 mm Hg

B) 40 mm Hg

C) 480 mm Hg

D) 1120 mm Hg

E) 60 mm Hg

45) A mixture of the gases N2, O2, and He has a total pressureof 760 mm Hg. If the partial pressure of

N2 is 90 mm Hg and of O2 is 270 mm Hg, What is the partialpressure of He?

A) 400 mm Hg

B) 1120 mm Hg

C) 120 mm Hg

D) 760 mm Hg

E) 360 mm Hg

46) In a gas mixture of 35% He and 65% O2 the total pressure is800 mm Hg. What is the partial

pressure of O2?

A) 520 mm Hg

B) 65 mm Hg

C) 280 mm Hg

D) 35 mm Hg

E) 100 mm Hg

47) Which molecule will undergo only Londondispersion forces when interacting with other

molecules of the same kind?

A) CH2Cl2

B) C4H10

C) C2H5OH

D) HF

E) NaC2H3O2

48) Which pair of molecules has the strongestdipole-dipole interactions?

A) CO2 and CO2

B) CO2 and CH4

C) NH3 and NH3

D) NH3 and CH4

E) CH4 and CH4

49) Which of the following cannot havehydrogen bonds?

A) HCl

B) HF

C) CH3NH2

D) H2O

E) NH3

50) The amount of energy involved in melting a substancewithout changing its temperature is called

the

A) joule.

B) heat of combustion.

C) heat of fusion.

D) calorie.

E) heat of vaporization.

Explanation / Answer

42) If a 0.614 g sample of a gas maintains a pressure of238 mm Hg when contained in a 1.0 L flask at

44) What is the total pressure of a mixture of He and H2 if thepartial pressures are 320 mm Hg and

800 mm Hg respectively?

        the

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