Graham's Law

Heavier gases have a __________________ rate of effusion.

• Faster

• Slower

• Rate of effusion does not depend on mass.

Which of the following would have a faster rate of effusion: 15g of S or 15g of N₂?

• Sulfur

• Nitrogen

• Both would have the same rate of effusion

Which of the following would have a faster rate of effusion: 12 mol of Chlorine or 10 mol of Helium?

• 12 mol of Chlorine

• 10 mol of Helium

Which of the following gases will effuse most slowly?

• Hydrogen

• Chlorine

• Ammonia

• Bromine

Which of the following would have a faster rate of effusion: 15g of Kr or 15g of N₂?

• Kyrpton

• Nitrogen

• Both would have the same rate of effusion

Identify the factor that determines rates of diffusion and effusion for different molecules at a given temperature.

• Size of the molecules

• Polarity of the molecules

• Temperature of the gas

• Molar mass of the gas

how many times faster does He effuse compared to N₂ (He = 4  N₂ = 28)

• 2 times faster

• 65 times faster

• 7 times faster

• 0.377 times faster

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

According to Graham's Law, which of the following gases will effuse faster?

• Oxygen (O_2)

• Hydrogen (H_2)

• Carbon Dioxide (CO_2)

• Nitrogen (N_2)

Graham's Law relates the rate of effusion of a gas to its:

• Volume

• Pressure

• Molar Mass

• Temperature