Pressure
Definition of Pressure
The force exerted per unit area
Definition of Volume
What is...
The amount of space occupied by a sample
Definition of Temperature
What is...
The average kinetic energy of all atoms/molecules of a substance
A gas in a 12.0 L container has a pressure of 3.00 atm at 300 K. How many moles are present?
Write down the formula you would use to solve this problem.
n= PV/RT
Define a DIRECT relationship and give an example using gas laws.
What is...
Two variables that relate by doing the same thing
Ex: Temp. and Pressure (Charles Law) or Moles and Volume (when pressure and temp. are held constant) (Avogadro's Law)
A 2.00 mol sample of gas occupies 10.0 L at 300 K. What is the pressure?
Given: n = 2.00 mol, V = 10.0 L, T = 300 K
Write down the formula you would use to solve this problem.
P=nRT/V
What volume will 3.00 mol of N₂ occupy at 2.50 atm and 350 K?
Write down the formula you would use to solve the problem.
V= nRT/P
A gas occupies 15.0 L at 1.20 atm with 0.750 mol. What is the temperature?
Write down the formula you would use to solve the problem.
T= PV/nR
A gas occupies 10.0 L at 1.20 atm and 25°C. How many moles of gas are present?
Solve the problem.
n= 0.490 mol
Define an INDIRECT relationship and give an example in the gas laws.
What is...
Two variables that relate by doing opposite things
Ex. pressure and volume (Boyle's law)
A container holds 4.0 mol of helium and 1.0 mol of argon at a total pressure of 10.0 atm. Find the partial pressure of argon.
Solve the problem in atm.
P(Ar)= 2.0 atm
A gas has a volume of 3.0 L at a pressure of 2.0 atm. What will the volume be if the pressure is increased to 6.0 atm, assuming temperature stays constant?
Write down the formula you would use to solve this problem.
P1V1=P2V2
A balloon has a volume of 2.5 L at 300 K. To what temperature (in K) must it be heated to have a volume of 3.75 L?
Solve the problem in K.
T2= 450 K
A sample of gas occupies 2.50 L at 0°C and 760 mmHg. Find the moles.
Solve the problem.
n= 0.112 mol
A gas has an initial pressure of 1.20 atm, a volume of 5.00 L, and a temperature of 290 K.
At constant moles, if the temperature rises to 350 K and the pressure increases to 1.50 atm, find the final volume.
Write down the formula that you would use to solve this formula.
V2 = P1V1T2/P2T1
A gas occupies 1.50 L at 1.00 atm and 273 K. What will the pressure be if the volume changes to 0.750 L and the temperature increases to 546 K?
Write down the formula you would use to solve for this problem.
From P1V1/T1 = P2V2/T2...
P2= P1V1T2/V2T1
A balloon has a volume of 500 mL at 27°C. What will the volume be at 77°C?
Solve the problem in mL.
V2= 583 mL
A gas has an initial pressure of 750 mmHg, a volume of 2.00 L, and a temperature of 273 K.
If the pressure is increased to 900 mmHg and the volume decreases to 1.50 L, what is the final temperature?
Write down the formula you would use to solve this problem
T2 = P2V2T1/P1V1
A 5.00 L sample at 1.50 atm and 350 K contains how many moles?
Solve the problem in moles.
0.26 mol
A gas exerts 0.950 atm at 275 K and 2.00 L.
What was the initial pressure if it previously occupied 1.50 L at 300 K?
Solve the problem in atm.
P1= 1.38 atm
What pressure (atm) is exerted by 1.50 mol of O₂ in a 5.00 L tank at 25°C?
Solve the problem in atm.
7.34 atm
A gas sample exerts 1.20 atm at 273 K with 0.500 mol of gas. Find its volume.
Solve the problem in L.
9.34 L
2.00 mol of CO₂ occupies 20.0 L at 2.00 atm. What is the temperature?
Solve the problem in K.
244 K
A balloon initially contains 2.00 L of gas at 1.00 atm and 300 K. More gas is added until it reaches 3.50 L at the same T and P. How many moles of gas were added?
Solve the problem.
n added= 0.0607 mol
A gas at 1.80 atm, 350 K, and 6.00 L changes conditions to 1.20 atm and 300 K.
What was the original volume?
Solve the problem in L.
V1= 4.67 L