Question

Calcular la fracción molar de la siguiente mezcla:
70 g de agua oxigenada (H 2 O 2) en 100 g de agua

Answer 1

Mm H2O2 = 34 g/mol
          H2O = 18 g/mol

soluto = agua oxigenada
solvente = agua

1. calcular moles   n = m/Mm

n H2O2 = 70 g/ 34 g/mol = 2.058 mol
n H2O = 100 g / 18 g/mol = 5.556 mol

2. calcula moles totales

n totales = nsto + n svte
n totales =2.058 moles + 5.556 moles = 7.614 moles

3. calcular Fracción molar del soluto

X sto =   n sto
           ````````````
            n totales

X sto =  2.058 moles
            ``````````````````
              7.614 moles

Xsto = 0.2703

4. Calcular fracción molar del solvente

Xsvte =  n svte
            ````````````
             n totales

Xsvte = 5.556 moles
            ``````````````````
             7.614 moles

Xsvte = 0.729