Question

one gram of wood burns in air.the resultant mass of ash is less than one gram.explain why?​

Answer 1

Answer:

By burning the log, you have combined its components with oxygen. Therefore, if you were somehow able to capture the entire amount of products after the reaction, you would have the weight of the log plus the weight of oxygen that was used to burn that particular log, as the result.

So in short, if you could capture the products (CO2, H2O, C, CO, etc), you would have a greater mass than what you started with, as you have combined the log's components with oxygen in order to burn it.

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