Unit 1: Gases Flashcards
molar mass units
g/mol
Avogadro’s number converts _________ to ____________
moles, particles
percent yield formula
actual yield/theoretical yield x 100%
if an object is more dense than water, it will ____________ when placed in water
sink
if an object is less dense than water, it will __________ when placed in water
float
solid water is __________ dense than liquid water
less
ideal gas law formula
PV = nRT
“at STP” means T = ____K and P = _ atm
273, 1
one mole of any IDEAL gas occupies _______ at STP
22.4 L
what is number density
moles per volume (mol/L)
what is mass density
“density”; mass per volume (g/L)
for an ideal gas, gases are very _________, __________ molecules, spaced ______________
small, discrete, very far apart
for an ideal gas, molecules are in ____________, ______________, _____________ motion until they hit another molecule or wall
constant, random, straight-line
for an ideal gas, any collision is perfectly ___________; no energy is ________ or __________
elastic, lost, gained
for an ideal gas, gas particles do not __________ each other (there are no ______________ forces)
attract, intermolecular
Root Mean Square Velocity (vrms) calculates the average ________ of particles in the units of ________
speed, m/s
unit for mass in vrms?
kg/mol
same temp = _________ KE
same
Boyle’s Law formula
P1V1 = P2V2
Charles’ Law formula
V1/T1 = V2/T2
bigger the molecule, _________ the “b” value
bigger
P (V - nb) = nRT
V = ?
measured volume
P (V - nb) = nRT
nb = ?
volume if ideal
gases behave most ideally at _______________________________
low pressures and high temperatures
when comparing balloons, same volume = same number of ________ or _______________
moles, gas particles
You have a 1L sample of gas in a container with movable walls. If you triple the pressure on the sample of gas, what would be the new volume?
1/3 = 0.33 L
Increasing the temperature of a gas sample from 100°C to 200°C under constant pressure would cause the volume to ____________ by a factor of ________
increase, about 1.25
473K/373K = 1.26
When comparing balloons, same pressure and temperature = ______________________________
same number density (mol/L)