Term
State Normal atmospheric pressure in five standard units 

Definition
1 atm
760 torr
101.3 kilopascals
14.7 lbs/square inch 


Term

Definition


Term

Definition
An instrument, invented by Torricielli in 1643, which measures atmospheric pressure. An evacuated glass tube in which a column of mercury rises or falls with changing pressure. 


Term

Definition
An instrument used to measure pressure of gases in a closed container. 


Term
State three postulates of the KineticMolecular Theory of Gases 

Definition
1. Matter is composed of very small particles; a gas is mostly empty space.
2. Particles are in constant random motion.
3. Collisions are elastic. 


Term
State the formula for Graham's Law of Diffusion. 

Definition
In a mixture of gases A, B:
(R_{A})(MW_{A})^{1/2} = (R_{B})(MW_{B})^{1/2}
MW = Molecular Weight
R = Rate of diffusion 


Term
Do heavy or light gases diffuse faster? 

Definition
Light gases diffuse faster. 


Term

Definition
V_{1}/T_{1} = V_{2}/T_{2}
Volume and temperature have a direct relationship when pressure and moles of gas remain constant.
V = volume
T = Kelvin 


Term
Solve this problem:
At 300 K, a gas has a volume of 10 liters.
Find the volume at 400 K 

Definition
Use Charles' Law: V_{1}/T_{1} = V_{2}/T_{2}
V_{2} = 13.3 L 


Term

Definition
(P_{1})(V_{1}) = (P_{2})(V_{2})
Pressure and volume have an inverse relationship when temperature and moles of gas remain constant.
P = Pressure
V = Volume 


Term
A sample of gas has a volume of 25 L at 800 torr. Find the volume at 400 torr. 

Definition
Use Boyle's law: (P_{1})(V_{1}) = (P_{2})(V_{2})
V_{2} = 50 L 


Term

Definition
P_{1}V_{1}/T_{1} = P_{2}V_{2}/T_{2}
Moles of gas constant
P = Pressure
V = Volume
T = Kelvin 


Term
Dalton's Law of Partial Pressures 

Definition
In a gas mixture, the total pressure equals the sum of the partial pressures of each component.
P_{total} = P_{1} + P_{2} + P_{3} ..... 


Term

Definition
PV = nRT
P = Pressure (atmospheres)
V = Volume (liters)
n = # of moles
R = 0.0820 (L atm)/(mol K)
T = temperature in K 


Term
How many moles of H_{2} gas are there in 20 L at 4 atm and 400K? 

Definition
Use the Ideal Gas Law: PV = nRT
n = 2.44 moles 


Term

Definition
Standard temperature (0 C, 273 K) and standard pressure (1 atm or 760 torr) 


Term
GayLussac's Law of Combining Gas Volumes 

Definition
When only gases are involved in a reaction, the volumes of reactants and products are in a small, whole number ratio. 


Term
Avagadro's Law (for gases) 

Definition
Under the same conditions of temperature and pressure, equal volumes of gases contain equal numbers of moles. 


Term
What is the volume of 1 mole of any gas at STP? 

Definition


Term
N_{2} + 3H_{2} ↔2 NH_{3}
In the above reaction, how many L of NH_{3} will be produced from 6 L of H_{2}? 

Definition
According to GayLussac's Law, the volumes of gases are in direct proportion to the coefficients in the equation.
x = 4 L of ammonia 

