When a log of wood burns completely,only ash is left behind.The mass of ash is much less than the mass of log of wood. How is the law of conservation of mass applied here ?
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The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction. For example, when wood burns, the mass of the soot, ashes, and gases equals the original mass of the charcoal and the oxygen when it first reacted. So the mass of the product equals the mass of the reactant
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the mass which is less is due to the water inside the log of wood which is evaporated when we burnt it . these water molecules changes into gases and moves upward in the atmosphere .that one is not counted here .
otherwise the law of conservation of energy is applied here
i hope this helps you
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