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chemistry

In a magnesium oxide experiment
Describe the effect of the following factors, whether decrease, increase, or has no effect on the reported value of Mg to O mole ratio:

a) if carbon is deposited on the crucible's surface(due to improper heating) and the crucible with contents is weighed without removing the carbon residue.
b) if the magnesium oxide ash is not dried completely.
c) if rapid oxidation of magnesium occurs by too much air, and some Mg is lost.
d) if air is not allowed sufficiently to react with Mg.

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