-Plant cells have cell walls to keep the cell rigid, but animal cells don't
-Plant cells have a large permanent vacuole, but animal cells don't. Animal cells will either have a small vacuole or none at all.
-Plant cells have chloroplasts, which contain chlorophyll, so photosynthesis can take place. Animal cells don't need to photosynthesise and therefore do not need chloroplasts.
-Animal cells contain flagella, but in plant cells flagella is only found in gametes(sex cells)
Chromatography separates things according to their weight.
The way to start it is simply by converting 0.239 L of dinitrogen oxide gas into moles of gas using the ideal gas equation
at STP , 1 mol of gas is 22.4 L of gas, or you could simply use pv = nRT
hope this helps