The maximum amount of magnesium oxide that can be produced during the reaction is 5.3 grams.
From the given reaction:
Mg + O2 → MgO
we see that if 1 mole of Mg reacts to 1 mole of oxygen, it produces 1 mole of MgO.
So, generally if x moles Mg is taken then it will combine with X moles of O2 to produce x moles of MgO.
Now the number of moles in 3.2 grams of Mg = given mass/ molar mass
x = 3.2/24.2
x = 0.132 moles
So it will react with 0.132 moles of oxygen and produce 0.132 moles of MgO, the rest of the oxygen will be left unused.
So, the maximum amount of MgO produces is 0.132 moles, converting to grams
0.132 moles of MgO = 0.132× molar mass of MgO
= 0.132 × 40.3g
0.132 moles of MgO = 5.3 grams of MgO is produced.
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