Explain a reason Kevin used a stopper in his experimental setup and what could happen to the mass of the roducts of this reaction if the stopper were not used
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Kevin used a stopper in his experimental setup to prevent any gas or vapors produced during the reaction from escaping the reaction vessel. This ensures that all the reactants are enclosed and that the reaction proceeds in a closed system.
If the stopper were not used, the gas or vapor produced during the reaction could escape into the surrounding environment. This would result in a loss of mass from the reaction vessel, leading to inaccurate measurements of the mass of the products of the reaction. This could also impact the overall outcome of the experiment and could potentially lead to incorrect conclusions being drawn.