Question

Cate grame si cati atomi se gasesc in 5 moli de oxigen ?

Answer 1

M.molec. a O2 = 16x2 = 32 g/mol ... adica:

1 mol O2 cantaresc 32 g

5 moli......................... a = 5x32 = 160 g O2

sau

aplicam relatia nr. de moli niu

niu = masa/M.moleculara => masa = niuxM.molec

= 5x32 = 160 g O2

1 mol O2 ....... 2x6,022x10la23 atomi

5 moli ..............b = 6,022x10la24 atomi O