After the chemical reaction took place, some of the resulting mass turned into smoke and was released into the atmosphere.
The law of conservation of mass or matter states that matter cannot be created or destroyed in a chemical reaction. That is, in every chemical reaction, the total mass of the reactant must be equal to the total mass of the product.
Mass of reactant = Mass of product
When the 300 kg wood burns, the mass of the ashes and smokes released will be equal to the original mass of the wood and oxygen during initial combustion.
Thus, we can conclude that the remaining 290 kg was turned into smoke and was released into the atmosphere.
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