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342 gr sacarosa ⇒ 1 mol
125 gr sacarosa ⇒ x moles
125x1 : 342 = 0,36 moles de sacarosa en ⇒ 450 ml de solucion
x moles en ⇒ 1000 ml de solucion
1000x0,36 : 450 = 0,8M ( molaridad )