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1. Which of the following sets of conditions would be LEAST likely to result in ideal gas behavior?
2. What is the density of neon gas in at STP?
3. A leak of helium gas through a small hole occurs at a rate of How will the leakage rates of neon and oxygen gases compare to helium at the same temperature and pressure?
4. A 0.040 g piece of magnesium is placed in a beaker of hydrochloric acid. Hydrogen gas is generated according to the following equation:
The gas is collected over water at 25°C, and the gauge pressure during the experiment reads 784 mmHg.
The gas displaces a volume of 100 mL. The vapor pressure of water at 25°C is approximately 24.0 mmHg. Based on this data, how many moles of hydrogen are produced in this reaction? (Note:
5. Ideal gases:
I. have no volume.
II. have particles with no attractive forces between them.
III. have no mass.
6. An 8.00 g sample of NH4NO3 (s) is placed into an evacuated 10 L flask and heated to 227°C. After the NH4NO3 completely decomposes, what is the approximate pressure in the flask?
NH4NO3 (s) → N2O (g) + H2O (g)
7. The kinetic molecular theory states that:
8. The plots of two gases at STP are shown below. One of the gases is 1.0 L of helium, and the other is 1.0 L of bromine. Which plot corresponds to each gas and why?
9. A balloon at standard temperature and pressure contains 0.20 moles of oxygen and 0.60 moles of nitrogen. What is the partial pressure of oxygen in the balloon?
10. Given that the gases at the center of the sun have an average molar mass of compressed to a density of under 1.30 × 109 atm of pressure, what is the temperature at the center of the sun?
11. The gaseous state of matter is characterized by which of the following properties?
I. Gases are compressible.
II. Gases assume the volume of their containers.
III. Gas particles exist as diatomic molecules.
12. A gas at a temperature of 27°C has a volume of 60.0 mL. What temperature change is needed to increase this gas to a volume of 90.0 mL?
13. A gaseous mixture contains nitrogen and helium and has a total pressure of 150 torr. The nitrogen particles comprise 80 percent of the gas, and the helium particles make up the other 20 percent of the gas. What is the pressure exerted by each individual gas?
14. In which of the following situations is it impossible to predict how the pressure will change for a gas sample?
15. Experimenters notice that the molar concentration of dissolved oxygen in an enclosed water tank has decreased to one-half its original value. In an attempt to counter this decrease, they quadruple the partial pressure of oxygen in the container. What is the final concentration of the gas?
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