Question 3

1. The electronic structure of atoms and molecules may beinvestigated using photoelectron spectroscopy. An electron in aphotoelectron spectrometer is accelerated from rest by a uniformelectric field to a speed of 420 km s^−1 in 10 µs.Determine the kinetic energy of the electron?

a.

8.0 x 10-2 N.m

b.

1.6 x 10-25 N.m

c.

3.8 x 10-25 N.m

d.

4..0 x 10-2 N.m

Question 4

1. The electronic structure of atoms and molecules may beinvestigated using photoelectron spectroscopy. An electron in aphotoelectron spectrometer is accelerated from rest by a uniformelectric field to a speed of 420 km s^−1 in 10 µs.Determine the magnitude of the work done on the electron.

a.

1.6 x 10-25 J

b.

8.0 x 10-2 J

c.

1.6 x 10-19 J

d.

4.0 x 10-2 J

10 points

Question 5

1. The most probable distance of an electron from the nucleus inthe lowest energy state of a hydrogen atom is called the Bohrradius: a₀ = 52.9 pm. What is the electrostaticpotential energy of interaction between the nucleus and theelectron at this separation?

a.

(-) 5.48 x 10 -18 J

b.

(-) 5.48 x 10 -17 J

c.

(-) 4.36 x 10 -18 J

d.

(-) 8.72 x 10 -18 J

10 points

Question 6

1. At sea level, where the pressure was 104 kPa and thetemperature 21.1 °C, a certain mass of air occupied 2.0m³. To what volume will the region expand when it hasrisen to an altitude where the pressure and temperature are 880 Paand −52.0 °C, respectively?

a.

0.18 m3

b.

17.8 m3

c.

-9.9 m3

d.

178 m3

Question 7

1. A gas mixture is used to simulate the atmosphere of anotherplanet consists of 320 mg of methane, 175 mg of argon, and 225 mgof nitrogen. The partial pressure of nitrogen at 300 K is 15.2 kPa.Calculate the volume of the mixture.

a.

1.32 x 10-3 m3

b.

0.28 m3

c.

1.32 m3

d.

36.92 m3

10 points

Question 8

1. Using the same given provided in question #7, calculate thetotal pressure of the mixture.

a.

6.1 kPa

b.

378.9 kPa

c.

61.3 kPa

d.

61.3 Pa

10 points

Question 9

1. The composition of planetary atmospheres is determined in partby the speeds of the molecules of the constituent gases because thefaster-moving molecules can reach escape velocity and leave theplanet. Calculate the mean speed of CH₄ molecules at 77Kand 1500K.

a.

346 m/s, 1308 m/s

b.

346 m/s, 1527 m/s

c.

681 m/s, 1247 m/s

d.

681 m/s, 1527 m/s

Question 10

1. Please calculate the pressure exerted by 1.0 molC₂H₆ behaving as a van der Waals gas when itis confined under the following condition at 1000 K in 100cm³.

a.

3346 atm

b.

1718 atm

c.

2267 atm

d.

4756 atm