Chemistry questions

1. Which of the following sets of conditions would be LEAST likely to result in ideal gas behavior?
   A. High pressure and low temperature
   B. Low temperature and large volume
   C. High pressure and large volume
   D. Low pressure and high temperature
2. What is the density of neon gas in g/L at STP?
   A. 452.3
   B. 226.0
   C. 1.802
   D. 0.9018
3. A leak of helium gas through a small hole occurs at a rate of 3.22*10-5mol/s. How will the leakage rates of neon and oxygen gases compare to helium at the

same temperature and pressure?
A. Neon will leak faster than helium; oxygen will leak faster than helium.
B. Neon will leak faster than helium; oxygen will leak slower than helium.
C. Neon will leak slower than helium; oxygen will leak faster than helium.
D. Neon will leak slower than helium; oxygen will leak slower than helium.

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:

Mg (s) + 2 HCl (aq) → MgCl2 (aq) + H2 (g)

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:

A. 4.04 × 10-5 moles hydrogen
B. 4.09 × 10-3 moles hydrogen
C. 3.07 × 10-2 moles hydrogen
D. 3.11 moles hydrogen

5. Ideal gases:
   I. have no volume.
   II. have particles with no attractive forces between them.
   III. have no mass.
   A. I only
   B. II only
   C. I and II only
   D. I, II, and III

Sample Solution