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0,78 mol --------1 litro
x ---------------- 0,500 Lt
x = 0,78 mol x 0,500 litro = 0.39 mol
1 litro
msa molecular Ba(OH)₂ = 171,34 g/mol
n = masa (g) / masa molecular m= númerode moles
despejar. m = n x Mm
m = 0,39 mol x 171,34 g/mol = 66.82 g ( simplicar moles)