When an object is burning, two atoms of oxygen (in the air) combine with one atom of carbon (from the substance burning). this produces three atoms that combine to form carbon dioxide gas. explain how the law of conservation of matter applies to this reaction.?

When you burn 1 carbon, 2 atoms of oxygen will react with the carbon which forms carbon dioxide with 3 atoms. The law conservation applies since it states that mass can never be created nor destroyed. In simple terms, the amount used for the reaction should be the same amount produced.