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. You have a chemical sealed in a glass container filled with air. The glass container has a mass of 200.0 grams and the chemical has a mass of500 grams. The total mass of the setup is 700 grams. The chemical is ignited by means of a magnifying glass focusing sunlight onto the reactant. After the chemical has completely burned, what is the total mass of the setup?
_______ grams
2. Dalton assumed that all atoms of the same element were identical in all their properties. Explain why this assumption is not valid.
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