Question

qual a massa de 3,2x10²³ moléculas de H2O?

Answer 1

Olá.

• H = 1 g/mol
• O = 16 g/mol

H2O: 1 + 2 x 16 + 33 g/mol

1 mol - 6 x 10^23
x mol - 3,2 x 10^23

6 x 10^23 x = 3,2 x 10^23
x = 3,2 x 10^23 / 6 x 10^23
x = 3,2/6 = 0,53 mol

1 mol - 33g
0,53 mol - x

x = 33.0,53 = 17,49g.

Bons estudos.