Answer :
The result is less than 2 kg because some of the mass is lost as a gas.
Two atoms or molecules combine to release energy. One of the two molecules is usually called oxygen, or something chemically called an oxidant. When molecules combine and release energy, it is released in the form of heat or light. Burning metal in a closed container does not change the total mass and contents of the container.
The matter is made up of atoms. Substances are stored in chemical reactions. Burning wood in a closed container does not change its mass. Wood is composed of fibers and minerals. When wood burns, oxygen in the air reacts with other elements to produce carbon dioxide, which is released into the atmosphere while minerals turn to ash. The primary products of combustion are carbon dioxide and water but other compounds may also be released.
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