Question

6.055*10^-2kg of washing soda is dissolved in water to obtain 1L of a solution of density 1077.2.calculate the molarity, molality and mole fraction of Na2CO3 in the solution​

Answer 1

Explanation:

mols Na2CO3.10H2O = grams/molar mass.

Then M = mols/L soln.

m = mols/kg solvent.

Use density to convert L soln to grams soln and subtract g Na2CO3.10H2O to find g solvent. Convert g solvent to kg and apply the definition for m.

mols fraction. You have mols solute. Convert grams solvent to mols. Add mols solute + mols solvent to obtain total mols. Then mole fraction Na2CO3.10H2O = mols Na2CO3.10H2O/total mols.