4.- solucion molar (x)

una disolucion contiene 20 g de NaOH Y 100G de H2o . calcula la fraccion molar deNaOH y h2o


DATOS :

       masa NaOH = 20 g                masa H2o =100g


 nNaOH =(20g) (_1 mol_) = 0.5mol                 nNaOH= (100g)(__1mol__)= 5.55mol
                             40g                                                                    18g



SOLUCION
                   X   nNaOH =___nNaOH____ =___0.5 MOL_____ =0.083
                                          n disolucion                 6.05



               X   h2O =___h2O____ =___0.5 MOL_____ =0.083
                                    n disolucion                 6.05



 observa que :

X naoh +Xh2o = 1 ---------------------0.083+ 0.917=1 -----------------1=1


por lo tanto , la suma de fracciones molares es igual a 1.