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I don't think the change in volume is significant. Furthermore, I believe the definition is moles of solute per liter of solution, thus it does not even matter if the volume changes. And for reference, 180 not 160.
The correct definition of a 1 M solution is 1 mole of (whatever it is, lets call it) glucose (so 180.16 g) in 1 L of the solution. This is not the same thing as 1 mole per litre of solvent.. if you add 1L of solvent to 1 mole of solute you won't (typically) get 1 L of solution.