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Osmolarity is defined as the # of particles in solution.

A rule to keep in mind is likes dissolve likes. So a covalently bonded substance like oil will only dissolve in a covalent solution. Same for polar substances etc.

That said, glucose being covalent, will NOT dissolve in water, while the ionic compound NaCl will.

The result is:

Glucose --> Glucose

NaCl --> Na+ and Cl- (Both are ions)

By the definition of osmolarity, glucose only produces 1 mol of particles, while NaCl produces 2. Those two numbers are their respective osmolarities.

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