STP (Standard temperature in Phoenix)
What is the ideal gas law equation?
PV=nRT
What is the combined gas laws equation
What is (P1V1)/T1 = (P2V2)/T2
OR
P1V1T2 = P2V2T1
One mole of gas at STP is equal to how many liters?
22.4L/mol
Avogadro's Law V1/n1 = V2/n2
(eyes up front)
This type of relationship is shown on the whiteboard
What is an inverse relationship
What is the constant R in (L)(atm)/(K)(mol)?
0.08206 (L)(atm)/(K)(mol)
What is the only inverse relationship equation?
what is Boyle's Law (P1V1=P2V2)
A gas has a pressure of 0.875 atm at 35.0 °C. What is the pressure at 272°C?
What is 1.55 atm?
What is 25C in Kelvin?
25+273 = 298K
A gas has a volume of 3.5L at STP. How many moles of gas is this?
PV=nRT
(1atm)(3.5L)=(n)(.08206)(273K)
n = 0.2 mol
V1/T1=V2/T2 Charles’s Law
600.0 mL of air is at 20.0 °C. What is the volume at 60.0 °C? (**hint - K. Keep in mL)
What is 682 ml?
A gas with a pressure of 735 mmHg and a volume of 4.0L is allowed to expand to a volume of 12L. What is the pressure of the gas when the volume reaches 12L if the temperature remains constant?
Double Jeopardy!
P1V1=P2V2
(0.967atm)(4.0L) = (P2)(12L)
P2 = 2.9atm
Double Jeopardy!
A gas has a volume of 300L at 150C. It is heated until it's volume is 600L. What is the new temperature of the gas if the pressure remains constant?
Double Jeopardy!
V1/T1 = V2/T2
300L/423K = 600L/T2
T2 = 846K or 800K
Double Jeopardy!
P1 = 0.99atm P2 = 0.65atm
V1 = 15.2L V2 =16.1L
T1 = ? T2 =15.0C
P1V1T2 = P2V2T1
T1 = P1V1T2/P2V2
T1 = (0.99*15.2*288.2)/(0.65*16.1)
T1 = 410K
A gas is transferred from a 15.0L container to a 30.0L container. During the transfer the gas cools from 350K to 295K. If the pressure is now 12.0atm, what was the original pressure?
P1V1T2 = P2V2T1
P1= (12.0*30.0*350)/(15.0*295)
P1= 28atm
Jennifer goes to the party store and buys a balloon for her sister’s birthday. The balloon is filled with 21.7L of helium gas at a temperature of 23.6C. If the pressure is 1.0atm, how many moles of helium are in the balloon?
PV = nRT
n = (PV)/(RT)
n=(1.0*21.7)/(0.08206*296.8)
n= .89 mol
A gas will increase in pressure inside a sealed container when heated. Which of the following is the best explanation for this in terms of kinetic molecular theory?
The particles gain more energy and therefore move faster, causing more collisions with the walls of the container.