Question

1. In cate g de Al se gasesc 5*6,023*10 la puterea -23 atomi?
2. In cate g de Fe se gasesc 10*6,023*10 la puterea -23 atomi de fier?

Answer 1

in 1mol Al se gasesc  6,023x10²³ atomi
    n=5...................5x6,023x10²³
m= nxA;    m= 5molx27g/mol=                        calculeaza !!!

in 1mol Fe...................6,o23x10²³ atomi
n=10.....................10x6,023x10²³atomi
m= nxA;    m= 10molx56g/mol=..............................calculeaza !!!!