Calculate the mass percent of KCl in a 0.35 m solution of KCl in water. Assume that the density of water is 1.00 g/mL.

Mass percent of KCl is 2.61 %

Explanation:

Our solute is KCl

Our solvent is water

m means molality (moles of solute in 1kg of solvent)

1 kg = 1000 g

0.35 m means that 0.35 moles of KCl are contained in 1000g of solvent

We determine mass of solute: 0.35 mol . 74.55 g/mol = 26.09 g

Total mass of solution is: mass of solute + mass of solvent

26.09 g + 1000 g = 1026.09 g

Mass percent of KCl = (mass of KCl/ mass of solution) . 100

(26.09 / 1026.09) . 100 =  2.61 %

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