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BlueSky06

A possible cause of a large percentage of error in an experiment where MgO is produced from the combustion of magnesium would be not all of the Mg has completely reacted. 

I hope this helps and if you have any further questions, please don’t hesitate to ask again. 

anniwuanyanwu1

Answer:

Not all the magnesium has completely reacted.

Explanation:

In a laboratory experiment to produce MgO through burning of a Magnesuim ribbon is achieved when all conditions are observed.

Opening the crucible at intervals slows the rate of the burning magnesium.

The magnesium reacts with air to form MgO.

In most experiments, not all the magnesium gets to completely react.