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What percentage mass of magnesium oxide is magnesium?

What is the percentage composition, by mass, of magnesium oxide?

  • Answer:

    Yup! It's easy, Rima. The total mass of one mole of magnesium oxide is just the sum of the atomic weights of the elements that make it up. so add 24 for magnesium and 16 for oxygen and you get 40. So 40 grams equals one mole. Sixteen grams of that 40 grams is oxygen and 24 grams is the fraction of the total weight that magnesium makes up. So: % oxygen = 16/40 x 100 = 40% and % magnesium = 24/40 x 100 = 60%

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Yup! It's easy, Rima. The total mass of one mole of magnesium oxide is just the sum of the atomic weights of the elements that make it up. so add 24 for magnesium and 16 for oxygen and you get 40. So 40 grams equals one mole. Sixteen grams of that 40 grams is oxygen and 24 grams is the fraction of the total weight that magnesium makes up. So: % oxygen = 16/40 x 100 = 40% and % magnesium = 24/40 x 100 = 60%

Larry

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