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Washington Comprehensive Assessment Of Science (WCAS) Grade 8 Practice Questions - Washington Comprehensive Assessment Of Science - Grade 8 Exam

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A student burns a 12-gram piece of magnesium ribbon in a sealed flask containing 8 grams of oxygen gas. A bright white flash occurs, producing magnesium oxide powder. What is the total mass of the contents inside the sealed flask after the reaction?
Correct Answer:
20 grams.

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