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

0.10 o s m o l

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0.20 o s m o l

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0.30 o s m o l

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0.40 o s m o l

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Solution

The correct option is D $0.40 o s m o l$
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

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