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1.2.3 Molar volumes - Coggle Diagram
1.2.3 Molar volumes
definition
The molar volume of a gas is the volume occupied by one mole at a particular temperature and pressure.
It is equal to 24 dm^3 at room temperature and pressure
Relation to Avogadro constant
Avogadro’s Law states that equal volumes of all gases, under the same conditions of temperature and pressure contain the same number of moles or molecules.
If the volume is 24 dm3, at room temperature and pressure, this number, once again, is the Avogadro constant.
n (moles)=V (cm^3/dm^3)/ Vm (cm^3 or dm^3 /mol)
V=n* Vm
What is the volume in dm^3 of 3.80 moles of carbon dioxide gas at STP?
Vm=V/n
How many moles are in 58.6 dm^3 of nitrogen gas at STP?
STP (Standard Temperature and Pressure)
0 degree Celsius and 1 atm
At STP, 1 mole of any gas takes up 22.4 dm^3 of volume
Given the volume of the gas and asking for the mass.
first using n= V/ Vm to find number of moles
Then use m=n x Mr to find the mass
Common mistakes
not at STP
Then use the ideal gas law
