Gas Relationships
At constant volume, what is the relationship between pressure and temperature?
As the temperature increases, the pressure increases.
As the temperature decreases, the pressure decreases.
(Direct)
At STP
1.0 atm = 760 mm Hg = 101.3 kPa
Convert 4.000 atm to mm Hg
3,040 mm Hg
P1 = 3.0 atm
V1 = 5 L
P2 = 6.0 atm
V2 = ?
2.5 L
What is the total pressure if a gas contains .3 atm of oxygen, 2.0 atm of nitrogen, and .2 atm of hydrogen?
2.5 atm
What is the ideal gas law equation?
PV = nRT
At constant pressure, what is the relationship between volume and temperature?
As the temperature increases, the volume expands (increases)
Direct
Convert -60 C to K
213 K
V1 = 5 L
V2 = 10 L
P1 = 300 mmHg
P2 =?
150 mm Hg
What is the formula for Dalton's Law collected over water?
Ptotal = Pgas + PH2O
How do you know which gas constant R to use?
It depends on the pressure unit.
R is .0821 when pressure is atm
True or False: Boyle's law is the relationship between Pressure and Volume at constant temperature
True
Which temperature is impossible?
Anything below absolute zero (0K)
v1 = 30 mL
v2 = 60 mL
T1 = 200 K
T2 =?
400 K
40% of a gas container's pressure if made of H2 gas. The entire pressure of the container is 3.0 atm. What is the pressure of H2?
1.2 atm
what is the number of moles of argon gas when the pressure is 1.0 atm, volume is 2.0 L , and 300 K
n = .081 moles
True or False: Heating a balloon for a long period of time will cause it to explode
True
Convert 383 K to C
110 C
P1 = 1.0 atm
v1 = 50 mL
T1= 20 C
p2 = ?
v2= 100 mL
T2 = 30 C
p2 = .52 atm
Daily Double
What is the total pressure of a gas container with three gases of 2.0 atm, 1.0 atm, and 3.0 atm, respectively?
8.0 atm
How many Liters are needed to bring .25 mol of CO2 gas at a pressure of .75 atm and 300 K?
8.2 L
Gay-Lussac Law is direct or indirect?
Direct
Convert 503 mL to L
0.503 L
p1 = 500. mmHg
v1 = 4.0 L
t1 = 200 K
p2 = 250 mm Hg
V2 = ?
t2 = 300 K
12 L
473.8 mmHg
How many grams of Cl2 gas are produced when 100. kPa of a 4 L container of gas is heated to 400 K?
n = .12 mol x (70.906 g/mol Cl2) = 8.5 g Cl2