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90g Mg - X
X=22,6 x 10 do 23 atomów
1 mol - 24g
X - 90g
X=3,75 moli
24g Mg ------ 1 mol
90g Mg ------ x moli
to x= (90g*1mol)/24g= 3,75 mola
1mol ------ 6,02*10²³cząsteczek
3,75mola ------ x cząsteczek
x= 22,575*10²³cząsteczek