Question

Calcule o numero de moleculas de 150g de KBr. Dados: massa atômica: K= 39; Br = 80;

Answer 1

1 mol de KBr---------------119g
x mol KBr------------------150g
x=150/119
x=1,26 mols
1mol----------------6,022×10^23 moleculas
1,26 mols---------x moleculas
x=7,59 ×10^23 moleculas de KBr