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Nothing. In a closed system you cannot create or destroy mass by heating. Picture taking a sealed cansiter of water and heating it on the stove. The water inside would get hotter and the pressure would increase and it would all eventually become steam. But since no water has escaped and none has been added the amount of mass inside the cansiter hasn't changed so it will still weigh the same. The only time it would change is if you had an open system, like an uncovered pot on the stove where the steam is allowed to escape. Since steam is exiting the system the mass is decreased and the weight is decreased.

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16y ago
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15y ago

The total weight involved in the burning does not change. Thus you have to add the original substance plus the oxygen used in the burning, and then total the residues, which will probably be the solid remains like ash, plus the gases given off, like carbon dioxide. These totals before and after will be the same

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15y ago

No.

Its density may decrease, but total weight stays the same.

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