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  4. On analysis a certain compound was found to contain iodine and oxygen in the ratio of 254 g of iodine (at. mass 127 ) and 80 g oxygen (at. mass16). What is the formula of the compound ?

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Q. On analysis a certain compound was found to contain iodine and oxygen in the ratio of $254 \,g$ of iodine (at. mass $127$ ) and $80 \,g$ oxygen (at. mass$16$). What is the formula of the compound ?

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Solution:

Moles of iodine $=\frac{247}{127}=2$
Moles of oxygen $=80/16=5$
Formula $=I_{2}O_{5}$