At the start of the coal combustion experiment, the combined mass of the coal and oxygen reactants was 100 grams. At the end of the coal combustion
experiment, the mass of the sample was 100 grams. Why does the scale
showing the mass at the end of the reaction give a mass of 100 grams, when
there is only a small amount of solid particles remaining on the scale?
A. Additional oxygen was created during the combustion reaction.
B. Additional coal was created during the combustion reaction.
C. The mass of the coal particles remaining at the end of the experiment was
100 grams.
D. The mass of the carbon dioxide gas and other byproducts at the end of
the experiment was 100 grams.