Question

What is the osmolarity of a $0.20M$ KCl solution?

• A. $0.10osmol$
• B. $0.20osmol$
• C. $0.30osmol$
• D. $0.40osmol$

Answer 1

The correct option is D $0.40osmol$

Osmolarity of a solute=molarity*number of particles produced per mole of the compound

M=0.20M

KCl-----------> K+ +Cl-

Total number of moles produced=2 moles

so osmolarity=$0.20\times 2$

=0.40 osmol KCl