The following diagram represents the reaction of methane with oxygen gas to form carbon dioxide and water. The chemical reaction shown above takes place in a closed system. What is true about the system while the reaction occurs?
A.
The total number of particles in the system increases.
B.
The total number of particles in the system decreases.
C.
The total mass of the particles in the system stays the same.
D.
The total mass of the particles in the system increases.

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