Question

calcula la molalidad de una solucion que contiene 64 gr. de metanol CH3OH en 500 ml. de la solucion ?

Answer 1

Mm CH3OH = 32 g/mol

mol = 64 g / 32 g/mol

mol = 2

1 Kg ---- 1000 mL
   X  -----  500 mL
x = 0.500 Kg

molalilad = moles soluto / Kg

m = 2 mol / 0.500 Kg

m = 4 mol/Kg

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 Molaridad

M = mol soluto / V(L)

M = 2 mol / 0.500 L

M = 4 mol / L