Respostas

2014-04-10T00:57:26-03:00
1u (unid. de massa atomica) = 1,67.10^-24 g
so regra de tres simples....
1u .................1,67.10^-24 g
x....................5.10^-23 g

x = 5.10^-23 / 1,67.10^-24
x ≈ 3.10 = 30u
3 3 3