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WorksheetsGraham's Law of Effusion
Total questions: 15
Worksheet time: 15mins
An unknown gas diffuses 0.25 times as fast as helium gas (He). What is the molecular mass of the unknown gas?
64 g/mol
16 g/mol
32 g/mol
4 g/mol
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: 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
why would O2 effuse faster than CO2 in the same room
because it has more energy
because it has a greater molar mass
because oxygen has a higher temperature
they will effuse the same because the temperature is fixed
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
Which of the following correctly describes effusion?
The movement of a gas into an area of higher pressure, always
The movement of a gas into a vacuum (lower pressure area)
The mixing of gases
None of the above
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 of Effusion, if gas A effuses four times faster than gas B, what is the ratio of their molar masses (M_A/M_B)?
1:16
1:4
1:2
1:8
Which of the following gases will effuse the fastest under the same conditions according to Graham's Law?
Oxygen (O_2)
Nitrogen (N_2)
Hydrogen (H_2)
Carbon Dioxide (CO_2)
If a gas effuses at a rate that is 0.5 times that of nitrogen gas (N_2), what is the molar mass of the gas? (Use 28 g/mol for N_2)
112 g/mol
56 g/mol
14 g/mol
7 g/mol
Graham's Law of Effusion can be used to separate isotopes of uranium. Which isotope will effuse faster, U-235 or U-238?
U-235
U-238
Both effuse at the same rate
Effusion rate is independent of isotopes
In an experiment, a gas is found to effuse through a small hole in 30 seconds, while the same amount of helium takes 10 seconds. What is the molar mass of the unknown gas? (Use 4 g/mol for He)
36 g/mol
16 g/mol
64 g/mol
144 g/mol
Which of the following statements best describes Graham's Law of Effusion?
The rate of effusion of a gas is inversely proportional to the square root of its molar mass.
The rate of effusion of a gas is directly proportional to its molar mass.
The rate of effusion of a gas is independent of its molar mass.
The rate of effusion of a gas is directly proportional to the square root of its molar mass.
