Question

qual a massa de 4 mols para a substancia de Ca(OH)2 ??

Answer 1

Massa molar Ca(OH)2 = 40 + 16 x 2 + 1 x 2 => 74 g/mol

1 mol --------- 74 g
4 mols ------- x g

x = 4 . 74 / 1

x = 296 g