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22% en eso significa 22g de soluto en cada 100 g de solucion
Moles= g/masa molar = 22g/138.205g/mol K2CO3) = 0.1591moles
V(L)= d=m/v
entonces v= m/d 100g / 1.24g/ml = 80.6mL que en litros es 0.086L
Despejamos de la formula de molaridad:
M= 0.1591moles / 0.086L = 1.85molar
Molaridad= Moles sto / Kg disolvente
100disolucion -22soluto = 78g solvente
M= 0.1591moles / 0.078Kg = 2.05Molal