Moles And Volumes Flashcards
What is the concentration of a solution?
This is the amount of solute, in moles, dissolved in each 1dm^3of solution.
What is a solute?
A dissolved compound.
What is the equation that links moles, volume and concentration together?
Moles= Concentration X Volume
What are the units for volume in the mol, vol, conc equation?
dm^3
How do you get from cm^3 to dm^3?
Divide by 1000
What is a standard solution?
This is a solution of a known concentration.
How do you prepare a standard solution?
Dissolve an exact mass of the solute in a solvent and make the solution is to an exact volume.
What is the main unit for concentration?
mol dm^-3
What are the other units for concentration that you may come across?
g dm^-3
How do you find the mass concentration of a substance?
Use mass=Mr X moles
Why do you indirectly count the number of gas molecules when you measure the gas volume?
At the same temperature and pressure, equal volumes of different gases contain the same number of molecules.
What is meant by molar gas volume?
This is the volume per mole of gas molecules at a stated room temperature and pressure.
What is the abbreviation for a molar gas volume?
Vm (it’s a little m)
What are the conditions for RTP?
20 degrees C
101 kPa
What is the volume of 1 mole of gas molecules at RTP?
24 dm3mol-1
What is the equation for gases at RTP?
Moles=volume/24
In the equation for RTP gases what are the units for volume?
dm3
What are the 4 assumptions for the molecules making up an ideal gas?
Random motion
Elastic collisions
Negligible size
No intermolecular forces
What is the ideal gas equation?
pV=nRT
What is the value of R, the gas constant?
8.134
What are the units for pressure in pV=nRT?
Pa
What are the units for volume in pV=nRT?
M3
What are the units for n in the ideal gas equation?
Mol
What are the units for temperature in pV=nRT?
K
How do you get from cm3 to m3?
X10^-6
How do you get from dm^3 to m^3?
X10^-3
How do you get from C to K?
+273
How do you get from kPa to Pa?
X10^3
