Question

cati atomi de sulf se gasesc intr o masa de 2.56 g ?

Answer 1

n=m/mu
n=nr de moli
m=masa oarecare
mu=masa moleculara=32g/mol

n=2,56g/32g pe mol=0,08mol

1 mol ...............6,022•10 la 23 atomi
0,08 mol..........X atomi

=> X=0,08 • 6,022•10 la23
X=0,48176• 10 la 23 atomi