p , n S ----> Z=16 ; A=32 -----> 16p , 16 e , 16 n
640 g S n=m:M ; n=nr. moli ; n=640 g: 32g/moli=20 moli S
32g S--------1mol S ---------16 . 6,023 .10²³ p---------16 . 6,023 .10 ²³ n
20 moli S -------------x --------------------------y
x=20 .16 . 6,023.10²³ p =
y= 20 . 16 . 6,023.10²³ n =