What would have to be true about any solvent for one of its dilute solutions to

Question

What would have to be true about any solvent for one of its dilute solutions to have essentially the same molar and molal concentrations? Select all that apply.

What is the molar concentration of KCl in this solution?

______M KCl(aq)

What would have to be true about any solvent for one of its dilute solutions to have essentially the same molar and molal concentrations? Select all that apply.

It cannot be volatile. The density must be very close to 1 g/mL. It must be polar. The volume cannot change appreciably as solute is added. It must be miscible with water.

Explanation / Answer

1. Molality= moles of solute/ kg of solvent

moles of KCl= given mass/ molar mass= 18.6 g/ 74.5 g/mol= 0.245 moles

Molality= 0.245/ 1kg= 0.245 m KCl

2. Mass % of KCl= mass of solute/ total mass of solute+ solvent*100= 18.6/ 18.6+1000 *100 = 1.82%

3. Mole % of KCl;

moles of KCl= 18.6 g/ 74.5 g/mol= 0.245 moles

moles of water= 1000 g/18 g/mol= 55.5 moles

nt= n1+ n2= 0.245+55.5= 55.745

X1= n1/nt = 0.245/55.745= 0.328

% X1= .328*100= 32.8%

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