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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?

A

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

B

Mass the sample as the reaction is run.

C

Run the reaction by filtration.

D

Run the reaction in an open system.

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