Chapter 7 Flashcards
chem 101 chap 7
What is the relationship between pressure and volume of a gas at constant temperature?
A. as volume increases, pressure stays stable
B. as volume decreases, pressure increases
C. as volume decreases, pressure decreases
D. as volume increases, pressure increases
as volume decreases, pressure increases
1 atm = ? mmHg
760 mmHg
At STP, one mole of an ideal gas occupies a volume of
22.414 liters
What does STP stand for?
Standard Temperature and Pressure
A sample of nitrogen gas occupies 8.60 L at 21 °C and 0.798 atm. If the pressure is increased,
to 1.27 atm at a constant temperature, what is the newly occupied volume?
A. 13.7 L
B. 5.4 L
C. 6.7 L
D. 8.60 L
B. 5.4 L
What is Boyle’s Law formula?
P1V1 = P2V2
0°C = ? Kelvin
273.15 K
1 atm = ? Pa
101,326 Pascal (Pa)
PV = nRT
P = ?
Pressure
PV = nRT
V = ?
Volume
PV = nRT
n = ?
Number of moles
PV = nRT
R = Ideal Gas Constant
A. 0.0821
B. 0.9097
C. 1.564
D. 22.414
A. 0.0821
PV = nRT
T = ?
Temperature
At STP the conditions are 273.15 K and __ atm
1
PV = nRT
The equation to find the pressure (P) is…
P = nRT/V
PV = nRT
The equation to find the volume (V) is…
V = nRT/P
PV = nRT
The equation to find the number of moles of gas (n) is…
n = PV/RT
PV = nRT
The equation to find the temperature (T) is…
PV/nR
60.25 L of an unknown gas has a mass of 75.3 g at STP. What is the identity of the unknown
gas?
A. Cl2
B. CO2
C. O2
D. N2
D. N2
A container filled with helium and argon gas is 16.00% by volume argon. What is the partial
pressure of argon if the total pressure inside the container is 6.88 atm?
1.1 atm
Oxygen gas (PO2 = 0.890 atm), nitrogen gas (PN2 = 1.340 atm), and carbon dioxide gas (PCO2 = 0.421 atm) occupy the same container. What is the total pressure in the container?
2.651 atm
What mass of fluorine is needed to fill an 724 L tank at STP?
1.23 kg
The pressure of a gas in a container is 1.23 atm and occupies a volume of 1.5 L. If the
original volume is doubled at constant temperature, what would happen to the pressure?
The pressure would decrease by half
A sample of nitrogen gas occupies 8.60 L at 21 °C and 0.798 atm. The pressure is increased
to 1.27 atm at constant temperature.
What is P1?
0.798 atm
A sample of nitrogen gas occupies 8.60 L at 21 °C and 0.798 atm. The pressure is increased
to 1.27 atm at constant temperature.
What is V1?
8.60 L
A sample of nitrogen gas occupies 8.60 L at 21 °C and 0.798 atm. The pressure is increased
to 1.27 atm at a constant temperature.
What is P2?
1.27 atm
A sample of nitrogen gas occupies 8.60 L at 21 °C and 0.798 atm. If the pressure is increased
to 1.27 atm at constant temperature, what is the newly occupied volume?
5.4 L
A _____ is a general instrument that utilizes a liquid column, typically mercury, to measure
pressure.
Manometer
