during an investigation, a scientist heated 123.6 g of copper carbonate till it decomposed to form a black residue. the total mass of the black residue formed was 79.6 g. does the law of conservation of mass hold true in this case? use complete sentences to justify your answer based on numerical calculations.
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during an investigation, a scientist heated 123.6 g of copper carbonate till it decomposed to form a...
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