The mass fraction of the element potassium in its oxide K2O is equal to ..
| November 22, 2020 | education
First you need to calculate the molecular weight (M).
To do this, add the atomic masses of the elements in the substance:
39 * 2 + 16 = 94.
Then you need to divide the atomic mass of potassium, multiplied by its amount, by the molecular weight, and then multiply that by 100%.
39 * 2/94 * 100 = 82.9. Round up and get 83%.
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