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The law of conservation of mass clearly states that the mass could not have been destroyed (nor created for that matter). Theresore, when the reaction with air took place, part of the mass of the sucrose would be converted to a gaseous state, and probably a chemical reaciton with the air would create a different compound, and would escape into the atmosphere. hope this answers the question.

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Q: Why is there a loss of mass when heating sucrose?
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