Ile atomów zawiera 1 mikrogram radu 226/88 Ra?
1 mikrogram to 0,000001 grama=1*10^-6
1 atom waży 226u
u = 1,66*10^-24g
masa 1 atomu to 226*1,66*10^-24g=3,7516*10^-22g
obliczamy ilość atomów
1*10^-6/3,7516*10^-22=2,665529374*10^-29
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1 mikrogram to 0,000001 grama=1*10^-6
1 atom waży 226u
u = 1,66*10^-24g
masa 1 atomu to 226*1,66*10^-24g=3,7516*10^-22g
obliczamy ilość atomów
1*10^-6/3,7516*10^-22=2,665529374*10^-29