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Sagot :
Answer
Explanation:
Magnesium Oxide has a formula of MgO.
Magnesium has a molar mass of 24.30g/mol and Oxygen has a molar mass of 15.99g/mol.
From this, we can say we are assuming a 1 mole sample of magnesium oxide, as the stoichiometric coefficients will always be the same, as will the ratio of oxygen to magnesium.
From this,
[tex]15.99g/mol *1 mol MgO = 15.99 gOxygen\\24.30g/mol *1molMgO=24.30gMagnesium\\Oxygen mass percent = 15.99/(15.99+24.30) = .396[/tex]
The Magnesium equation will be the same but a different numerator. Notice, if there were different coefficients on the elements, you would have to multiply by the stoich coefficient.
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