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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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`K:Cr:O=(26.57)/(39.1):(35.36)/(52):(38.1)/(16)`
`=0.67:0.67:2.38`
The empirical formula is `K_(2)Cr_(2)O_(7)`
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