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3,01*10^23at k--------x
x=19,5g
3,01*10^23 at potasu wazy 19,5g
n=N:Na
Na liczba avogadra = 6,02 *10 do 23
czyli
m:M = N: Na
m:39 = 3,01*10do23 : 6,02 *10 do 23
m= 19,5 g