11. The number of electron dots in the Lewis symbol for an element equals the
a.
number of outermost
p
electrons.
b.
number of electrons needed to fill the outermost
p
orbital.
c.
period number that contains the element.
d.
number of outermost
s
and
p
electrons.
e.
number of outermost
s
electrons.
Phases and Phase Equilibria
1. Calculate the pressure of 0.55 mol of NH
3
gas in a 2.00 L vessel at 25 °C, using the
ideal gas law.
a.
2.5 atm
b.
6.7 atm
c.
0.6 atm
d.
7.5 atm
e.
3.4 atm
2. A steel tank contains carbon dioxide at 34 °C and is at a pressure of 13.0 atm.
Determine the internal gas pressure when the tank and its contents are heated to 100 °C.
a.
10.7 atm
b.
9.4 atm
c.
38.2 atm
d.
1.9 atm
e.
15.8 atm
3. Deviations from the ideal gas law are less at:
a.
high temperatures and high pressures
b.
high temperatures and low pressures
c.
low temperatures and high pressures
d.
low temperatures and low pressures
e.
high volumes and low temperatures
4. A mixture of three gases has a pressure of 1380 mmHg at at 298 K. The mixture is
analyzed and is found to contain 1.27 mol CO
2
, 3.04 mol CO, and 1.50 mol Ar. What is
the partial pressure of Ar?
a. 238 mm Hg
b. 302 mm Hg
c. 356 mm Hg
d. 1753 mm Hg
e. 8018 mm Hg
