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1g -> 6,02*10²³u
xg -> 20u
x=(40u*1g):(6,02*10²³u)≈6,64*10⁻²³g
6,02*10 do 23= 40g
x=40/6,02*10do23=6,6*10 do -23 g
40g Ca-------6,02*10²³ atomów
xg Ca----------1 atom
x=40/6,02*10²³
x=6,64*10⁻²³g