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In a closed flask, magnesium reacts with oxygen and no gas escapes. Which statement correctly applies conservation of mass?.
- A.The total mass stays the same because atoms are rearranged, not created or destroyed.
- B.The mass increases because oxygen atoms are made during the reaction.
- C.The mass decreases because reactant atoms disappear when product forms.
- D.The mass changes unpredictably because a new substance has different properties.
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