You should proof your question. Proofing would have reminded you that you left out punctuation AND several words.
When you burn newspapers the mass of the ash will be less than the initial mass BECAUSE the ash is what is left. The other components of the combustion are CO2 and H2O which are gases during the burning phase.
A stack of newspapers is completely to Ash in a laboratory how does the results Mass relate to the initial mass of the stack of newspapers
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