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A student burns 2.0 g magnesium metal over a flame which reacts with excess oxygen. A white crystalline solid begins to form on the piece of magnesium.

$$2 Mg_{(s)}+ O_{2 (g)}\rightarrow 2 MgO_{(s)}$$

Which of the following would determine if the reaction obeyed the law of conservation of mass?


Mass the sample after the reaction is complete, and compare it to the mass before the reaction begins.


Mass the sample as the reaction is run.


Run the reaction by filtration.


Run the reaction in an open system.

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