Graham's Law

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

Grahams law refers specifically to

• the rate of diffusion

• the rate of effusion

• the temperature of gases

• the partial and total pressures of gases in a sample.

Which will travel faster: oxygen gas or helium gas?

• O₂

• He

Tags

NGSS.HS-PS3-2

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

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

Which of the following would have a faster rate of effusion?

• Helium

• Hydrogen

• Nitrogen

•     Oxygen

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

• Hydrogen (H2)

• Oxygen (O2)

• Carbon Dioxide (CO2)

• Nitrogen (N2)

If a gas effuses at a rate that is 0.5 times that of helium, what is the molar mass of the gas?

• 16 g/mol

• 32 g/mol

• 64 g/mol

• 128 g/mol