2. Each stopped flask below contains 2 liters of a gas at STP.

Each gas sample has the same:
a) density
b) mass
c) number of molecules
d) number of atoms

3. Under which conditions would a real gas behave most like an ideal gas?
a) low pressure and low temperature
b) low pressure and high temperature
c) high pressure and low temperature
d) high pressure and high temperature

4. The volume of a sample of a gas at 273C is 200. L. If the volume is decreased to 100. L at constant pressure, what will be the new temperature of the gas?
a) 0 K
b) 100. K
c) 273 K
d) 546 K

5. Which gas diffuses most rapidly at STP?
a) Ne
b) Ar
c) Cl₂
d) F₂

6. Which changes in pressure and temperature occur as a given mass of gas at 380 torr and 546 K is changed to STP?
a) The pressure is doubled and the temperature is halved.
b) The pressure is halved and the temperature is doubled.
c) Both the pressure and the temperature are doubled.
d) Both the pressure and the temperature are halved.

7. Real gas behavior deviates from ideal gas behavior because real gas particles have
a) no volume and no attraction for each other
b) no volume but some attraction for each other
c) volume but no attraction for each other
d) volume and some attraction for each other

8. At STP, which gas effuses at the fastest rate?
a) H₂
b) N₂
c) CO₂
d) NH₃

9. A 2.5-L sample of gas is at STP. When the temperature is raised to 273C and the pressure remains constant, the new volume of the gas will be
a) 1.25 L
b) 2.5 L
c) 5.0 L
d) 10. L

10. A gas occupies a volume of 500. mL at a pressure of 380 torr and a temperature of 298 K. At what temperature will the gas occupy a volume of 250. mL and have a pressure of 760. torr?
a) 149 K
b) 298 K
c) 447 K
d) 596 K

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