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Topic 1 – Matter and Energy
26: The Avogadro’s law
1. Under the same temperature and pressure, which is true of 1 L of Oxygen gas and 1 L of Nitrogen
gas?
1) They have equal number of molecules 3) They have equal density
2) They have equal mass 4) They have the same structure
2. AT STP, 2 L of He and 2 L of H2 have the same 3) number of molecules 4) number of atoms
2) density
1) Mass
3. At STP, a 2 L sample of CO2 contains the same number of molecules as 4) 4 L of SO2
1) 1 L of He
2) 2 L of He
3) 3 L of SO2
4. At STP, which gas sample contains the same number of molecules as a 22.4 L sample of Hydrogen?
1) 1 L of helium 2) 101.3 L of helium 3) 273 L of neon 4) 22.4 L of neon
5. Under which conditions would a 2 L sample of O2 has the same number of molecules as a 2 L sample
of N2 that is at STP?
1) 0 K and 1 atm 2) 0 K and 2 atm 3) 273 K and 1 atm 4) 273 K and 2 atm
6. The table below gives temperature and pressure of four different gas samples, each in a 1.5 L
container: Need Help? Study Book Pg 21 Set 32
Gas sample Temperature (K) Pressure (atm)
He 150 1.8
Ne 150 2.6
O2 150 1.8
CO2 100 2.6
Which two gas samples contain the same number of molecules?
1) He and Ne 2) He and O2 3) Ne and CO2 4) Ne and O2
27. Grahams law of diffusion:
1. The particles of which gas will diffuse at the fastest rate under the same temperature and pressure?
1) Xe 2) Kr 3) Ne 4) He
2. At STP, the molecules of which gas will travel the fastest?
1) Fluorine 2) Oxygen 3) Nitrogen 4) Chlorine
3. Which gas molecule will diffuse at the slowest rate under the same conditions?
2) N2
1) H2
4) F2
3) O2
4. Gas A, B, C and D have a mass of 20 g/mole, 30 g/mole, 40 g/mole, and 50 g/mole respectively.
If all gases are at the same temperature and pressure , which gas will diffuse the slowest?
1) A 2) B 3) C 4) D
138 Copyright © 2010 E3 Scholastic Publishing. All Rights Reserved. Survivingchem.com
Topic 1 – Matter and Energy
26: The Avogadro’s law
1. Under the same temperature and pressure, which is true of 1 L of Oxygen gas and 1 L of Nitrogen
gas?
1) They have equal number of molecules 3) They have equal density
2) They have equal mass 4) They have the same structure
2. AT STP, 2 L of He and 2 L of H2 have the same 3) number of molecules 4) number of atoms
2) density
1) Mass
3. At STP, a 2 L sample of CO2 contains the same number of molecules as 4) 4 L of SO2
1) 1 L of He
2) 2 L of He
3) 3 L of SO2
4. At STP, which gas sample contains the same number of molecules as a 22.4 L sample of Hydrogen?
1) 1 L of helium 2) 101.3 L of helium 3) 273 L of neon 4) 22.4 L of neon
5. Under which conditions would a 2 L sample of O2 has the same number of molecules as a 2 L sample
of N2 that is at STP?
1) 0 K and 1 atm 2) 0 K and 2 atm 3) 273 K and 1 atm 4) 273 K and 2 atm
6. The table below gives temperature and pressure of four different gas samples, each in a 1.5 L
container: Need Help? Study Book Pg 21 Set 32
Gas sample Temperature (K) Pressure (atm)
He 150 1.8
Ne 150 2.6
O2 150 1.8
CO2 100 2.6
Which two gas samples contain the same number of molecules?
1) He and Ne 2) He and O2 3) Ne and CO2 4) Ne and O2
27. Grahams law of diffusion:
1. The particles of which gas will diffuse at the fastest rate under the same temperature and pressure?
1) Xe 2) Kr 3) Ne 4) He
2. At STP, the molecules of which gas will travel the fastest?
1) Fluorine 2) Oxygen 3) Nitrogen 4) Chlorine
3. Which gas molecule will diffuse at the slowest rate under the same conditions?
2) N2
1) H2
4) F2
3) O2
4. Gas A, B, C and D have a mass of 20 g/mole, 30 g/mole, 40 g/mole, and 50 g/mole respectively.
If all gases are at the same temperature and pressure , which gas will diffuse the slowest?
1) A 2) B 3) C 4) D
138 Copyright © 2010 E3 Scholastic Publishing. All Rights Reserved. Survivingchem.com
