A metal oxide having an oxidation state of +2 contains 40% oxygen by weight. Identify this metal.
| September 27, 2021 | education
To solve this problem, we write the formula of the oxide, since the oxide itself is not known, let us call it MeO. Oxygen has an atomic mass of 16. According to the condition, oxygen is 40% of the mass of the oxide, hence the mass of the oxide is 16 / 0.4 = 40 g. Knowing the mass of the oxide, you can easily find the metal according to the periodic table. 40 – 16 = 24. Magnesium has an atomic mass of 24. So the oxide we are talking about is MgO.
The answer is the metal magnesium.
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