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se trabaja con la densidad del agua = 1 g/mL, entonces D = m/v
m = d x v
m = 1/20 = 0.05 g
mol = masa/Mm
mol = 0.05 / 18 g/mol
mol = 2.778
1 mol ---- 6.022 x 10²³ moléculas
2.778 mol ---- x
x = 1.672 x 10²¹ moléculas