The relative atomic mass of element X is 74.9. It forms an oxide containing 24.3% of oxygen by mass. What is the mole ratio of X to oxygen in the oxide?
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Form 4 Chemistry
2007-03-16 6:16 am
回答 (1)
2007-03-16 7:02 am
✔ 最佳答案
In 100 g of the oxide of X, Mass of X = 100 – 24.3 g = 75.7 g
Mass of O = 24.3 g
Since no. of moles = mass / (molar mass)
Mole ratio X : O = 75.7/74.9 : 24.3/16 = 1.01 : 1.52 = 2 : 3
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