Comparing your class data for the experiment would you expect the results (mote

Question

Comparing your class data for the experiment would you expect the results (mote ratio) to be the same from student to student? Defend your answer. Should the mole ratio vary depending on the amount of magnesium used? Defend your answer. (a) A student doing this experiment used magnesium that had a dull white coating. What is the chemical identity of the dull white coating? (b) What effect would this dull white coating have on the amount of magnesium? A student wanting to leave lab early did not wait for the crucible, cover, and contents to cool down completely. What would be the effect on the amount of magnesium measured? The amount of oxygen? What would happen to the mole ratio?

Explanation / Answer

3. No.the mole ratio of any molecule remains same irrespective what the procedure is according to law of defnite proportions.

4. No. as the amount of magnesium used will combine according to stoichiometric proportions only.

5a. the dull white coating is magnesium oxide.

5b.since the white coating formed is an oxide of magnesium which is formed due to the reaction of some quantity of magnesium with air the amount of magnesium decreases.

6.Amount of magnesium measured will show increased value as the amount of moisture also gets added up .hence oxygen content also increases .as a result mole ratio gets altered.

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