Worksheet Graham's Law of Effusion

1. Which of the following correctly describes effusion?

• The movement of a gas into an area of higher pressure, always

• a. The movement of a gas into a vacuum (lower pressure area)

• a. The mixing of gases

• a. None of the above

Which of the following correctly describes diffusion?

• The movement of gases into an area of higher pressure, always

• The movement of gases into a vacuum

• a. The mixing of gases

• a. Both (a) and (b)

The ratio of the speed of helium to gas X is 16:1. What is the molar mass of gas X? (use 4 g/mol for He)

• 1024

• 256

• 128

• 64

The ratio of the speed of neon to gas X is 3:1. What is the molar mass of gas X? (use 20 g/mol for Ne)

• 240

• 180

• 160

• 60

The molecular mass of gas X is 320 g/mol. The other gas is neon. What is the ratio of the speed of neon to that of gas X? (which gas is faster?? Use 20 for Neon)

• 4 to 1

• 2 to 1

• 16 to 1

• 20 to 1