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Lab report: Percentage composition by mass of magnesium oxide Introduction: Law of Definite Proportions is the law stating that a specific compound always contains the same elements in definite proportions by mass. We will experimentally determine the composition by mass of a substance and then convert he mass amounts to percentages, to give us the percentage composition. Magnesium is a silvery metal that burns with such a bright flame that it was once used in flashbulbs for photography. Magnesium oxide, a white powder, is produced as a result of the synthesis reaction of combustion magnesium. Hypothesis: The percentage composition by mass of magnesium oxide will be 60% magnesium and 40% oxygen. Purpose: To find the percentage composition by mass of magnesium oxide. Safety: * Wear eye protection. * Use crucible tongs to transfer hot crucible. * Care is required in using a lab burner and handling hot apparatus. * Magnesium ribbon burns with a hot flame and...

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