Graham's Law of Effusion

Under the same conditions, how many times faster will hydrogen gas effuse than carbon dioxide gas?

• 4.69

• 4.58

• 0.218

• 0.213

Which of the following would have the slower rate of effusion: 100 grams of O₂ or 100 grams of Cl₂?

• 100 grams of O₂ 

• 100 grams of Cl₂

• O₂ and Cl₂ would have the same rate of effusion

The rate of effusion of water vapor is 0.391 and the rate of effusion of propane is 0.251 at the same temperature and pressure.  What is the molar mass of propane? (write the formula and show your work)

• 44.0 g/mol

• 6.63 g/mol

• 0.37 g/mol

• 28.2 g/mol

Effusion and diffusion rates are inversely proportional to the square root of the molar mass of the gas.

• True

• False

Which will travel faster: oxygen gas or helium gas?

• O₂

• He

How much faster will He(g) travel than O₂(g)?

• 4 times faster

• 2.8 times faster

• 0.35 times faster

• 0.125 times faster

An unknown gas diffuses 0.25 times as fast as He (4 g/mol). What is the molecular mass of the unknown gas?

• 128

• 64

• 32

• 16

Tags

NGSS.HS-PS3-2

Effusion is

• used to describe the combustibility of a gas.

• ability of a gas to escape through a tiny opening

• what occurs after diffusion.

• the ability of a gas to mix with other gases.

why would O₂ effuse faster than CO₂ in the same room

• because O₂ has more energy

• because CO₂ has a greater molar mass

• because oxygen has a higher temperature

• they will effuse the same because the temperature is fixed

According to Graham's Law of Effusion, which gas will effuse faster under the same conditions?

• Hydrogen (H2)

• Oxygen (O2)

• Carbon Dioxide (CO2)

• Nitrogen (N2)