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Combining Magnesium and Oxygen
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| Submitted: Thu Jul 11 2002
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Combining Magnesium and Oxygen Purpose: The purpose of this experiment is to show that magnesium and oxygen combine in a definite whole- number ratio by mass, by using mass relationships. Data and Observations: a. Mass of empty crucible 11.8g b. Mass of crucible + Mg 12.35g c. Mass of crucible + oxide 13.11g d. Odor of vapor in step 6: The odor was similar to that of burning plastic. Calculations: 1. Mass of magnesium used: 0.55g 2. Mass of oxygen that reacted: 0.76g 3. Number of moles of Mg used: 0.023 mol 4. Number of moles of O that reacted: 0.048 mol 5. Ratio of moles of Mg to moles of O: MgO2 (1:2) Questions: 1. The empirical formula of magnesium oxide is MgO2. 2. The ratio of the mass in grams of magnesium used to the mass in grams of oxygen that reacted is 3 to 4 (3:4). The law of definite proportions states that specific substances always contain elements...
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