[[chemistry]]

**"calculation of relative quantities of reactants and products in chemical reactions"**

avogardos numbers = $6.02*10^{23}$
n=mole=conversion factor=$6.02*10^{23}$ things (atoms/ions/molecules/formulaunits/etc)
1 pair = 2  things
1 dozen = 12 things

one atomic unit ~=  1 gram / avogardos number
avogardos number x atomic unit ~= 1 gram