1. Cubic closest-packing Select one: a. has the same unit cell as hexagonal clos

Question

1. Cubic closest-packing

Select one:

a. has the same unit cell as hexagonal closest-packing.

b. has a face-centered cubic unit cell.

c. has a simple cubic unit cell.

d. has a body-centered cubic unit cell.

2. Which of the following should have the largest dipole moment?

Select one:

a. CH3I(g)

b. BCl3(g)

c. F2(g)

d. KBr(g)

H° is -39.04 kJ/mol and S° is -111.74 J/(mol K). What is the normal boiling point of pure HNO3?

Select one:

a. 270.3°C

b. 2.86°C

c. 76.2°C

d. 349.4°C

4. The highest coordination number for spherical packing is found in the

Select one:

a. body-centered cubic structure.

b. body-centered cubic and face-centered cubic.

c. simple cubic structure.

d. cubic closest-packing and hexagonal closest packing.

5. A 4.00-L flask contains nitrogen gas at 25°C and 1.00 atm pressure. What is the final pressure in the flask if an additional 2.00 g of N2 gas is added to the flask and the flask cooled to -55°C?

Select one:

a. 1.05 atm

b. 1.44 atm

c. 1.96 atm

d. 0.319 atm

6. One mole of which gas has the greatest density at STP?

Select one:

a. N2

b. All three gases have the same density.

c. CO

d. Ar

Select one:

a. 2.01 atm

b. 3.29 atm

c. 2.56 atm

d. 1.28 atm

8. Oxygen gas is collected over water in an inverted buret. The atmospheric pressure is 755 mm Hg, the vapor pressure of water is 26 mm Hg, and a 20.0 cm-high column of water remains in the buret. If the denstity of water is 1.00 g/mL and the density of Hg is 13.6 g/mL, then the pressure of the oxygen gas is

Select one:

a. 755 mm Hg.

b. 714 mm Hg.

c. 781mm Hg.

d. 729 mm Hg.

9. The mole fraction of carbon dioxide in a gas mixture is 0.200. There are 0.251 g of nitrogen and 0.322 g of oxygen in this gas mixture. What is the mass of carbon dioxide in this mixture?

Select one:

a. 0.373g

b. 0.838g

c. 0.216g

d. 0.0191g

10. Which of the following gases has the lowest average speed at 25°C?

Select one:

a. NH3

b. O2

c. H2S

d. CH4

Explanation / Answer

Cubic closest packing has the face centered cubic unit cell.

Therefore, the correct answer is option b.

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