Question

Cuantas moléculas existen en 80 gramos de CaCl2?

Answer 1

Mm CaCl2 =
Ca: 1 x 40 = 40 g/ml
Cl: 2 x 35.45 = 70.9 g/mol
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                 Mm = 110.9 g/mol

mol = masa/Mm

mol = 80 g/110.9 g/mol

mol = 0.721

       1 mol ------ 6.022 x 10²³  moléculas
0.721 mol ------              x

         x = 4.34 x 10²³ moléculas