A standard solution is a solution of known concentration. Standard solutions are prepared by dissolving an exact mass of the solute in a solvent and making up the solution to an exact volume
At the same temp and pressure, equal volumes of different gases contain the same number of molecules
The molar gas volumeVmโ is the volume per mole of gas molecules at a stated temp and pressure
At RTP (room temp and pressure), 1 mole of gas molecules has a volume of approx. 24.0 dm3
Therefore, at RTP, the molar gas volume = 24.0 dm3mol-1
mol = vol/molar gas vol
At RTP
mol = vol dm3/24
Assumptions for the molecules making up an ideal gas: