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A compound contains 26.57% potassium, 35...

A compound contains `26.57%` potassium, `35.36%` chromium and the remaining oxygen. What is its empirical formula? (At.wt. of K=39.1, Cr=52, 0=16) 

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Ratio of K : Cr : O = `(26.6)/(39.1) : (35.4)/(52) : (38.1)/(16) = 0.68 : 0.68 : 2.38 = 2 : 2 : 7`
The empirical formula is ` K_(2)Cr_(2)O_(7)`.
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