D)The students should burn the candle in a container that has some type of lid so that any gas that is a product of the reaction can be contained and massed.
The students should burn the candle in a container that has some type of lid so that any gas that is a product of the reaction can be contained and massed. Remember, the by-products of combustion include carbon dioxide and water vapor. These products escaped from the flask during combustion and the ending mass varied from the beginning mass.