Recrystallization problem! ORGANIC CHEMISTRY

Question

200 mg of impure sucrose was weighed out. After recrystallization from water, 225 mg of solid compound was obtained. What happened? How can this be corrected?

Answer 1

Obviously you cannot have a greater mass after recrystallization, so what could have happened to result in this increase in mass?  Since there is nothing present other than the original sample (200 mg) and water, it appears that there is now water associated with the final product. If the final recrystallized product is not completely dry, this will add to the mass.

Answer 2

If this is for a lab report and you're being asked to explain/justify a yield: a >100% yield ALWAYS means contamination, usually residual solvent (water in your case), or perhaps inorganic byproducts (i.e. salts from a workup). If the yield is less than 100%, some product was lost in workup or due to side reactions. If the yield is exactly 100%, pat yourself on the back for doing such a great reaction, but know that probably BOTH contamination AND losses are going on to a degree which just happen to cancel each other out. This might be some variant of Murphy's Law, not sure though.