Chapter 8 - The Gas Phase Flashcards
what is an ideal gas?
hypothetical gas with no intermolecular forces, occupies no volume
when does a gas not behave like an ideal gas?
high pressures (low volume) and low temperatures
equation for ideal gas law?
PV=nRT
what is density?
ratio of mass per unit volume (g/L for gases)
what is the volume of one mole at STP?
22.4 L
equation for combined gas law?
PV/T = PV/T
how to calculate molar mass?
(density at STP)(22.4 L/mol)
what is Avagadro’s principle?
all gases at a constant temperature and pressure occupy volumes directly proportional to the number of moles present; as the number of moles of gas increases, the volume increases in direct proportion
what is the equation for Avagadro’s principle?
n/v = n/v
what is Boyle’s law?
for a given gaseous sample held at constant temperature (isothermal), the volume of the gas is inversely proportional to its pressure; as pressure increases, volume decreases
equation for Boyle’s law?
PV=PV
what is Charle’s law?
at constant pressure, the volume of a gas is proportional to its absolute temperature; as temperature increases, pressure increases
what is the equation for Charle’s law?
P/T=P/T
how do gases behave when their is more than one gas in a container?
each gas will behave independently of the others; each will behave as if it’s the only gas in the container
what is partial pressure?
pressure exerted by each individual gas
