The compound K2O2 also exists. A chemist can determine the mass of K in a sample of known mass that consists of either pure K2O or pure K2O2. From this information, can the chemist answer the question of which compound is in the sample? Indicate yes or no, and explain.

Explanation:

The empirical formula of K₂O₂ is KO, and the empirical formula of K₂O is K₂O.

The chemist, once determined the mass of K in a sample of known mass, can calculate the mass of O by difference.

Once she has both masses she can determine the number of moles, using the atomic mass of each element.

Once she has the number of moles, she can determine the ratio of K moles to O moles, which tells the subscripts of the empirical formula.

Then, she will know whether the compound is KO (K₂O₂) or K₂O.

From this information, the chemist can answer the question of which compound is in the sample because she can find the empirical formula. Therefore, the option is yes.

In conclusion she can then get the compound in the sample whether it is KO, (K₂O₂) or K₂O.

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