Question

Qual a massa, em quilogramas, de 9,0 x 1027 átomos de hélio (He)? Dados: Constante de Avogadro: 6,0 x 1023; He = 4 g/mol; 1 kg = 103 g.

Answer 1

6,0 x 10²³ átomos de He ---------- 4 g

9,0 x 10²⁷ átomos de He ---------- x

x = 6 x 10⁴ g

x = 60 kg