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Determine the empirical formula (EF) of ...

Determine the empirical formula `(EF)` of the oxide of chomium containing `68.4% Cr` by mass.

A

`Cr O_(3)`

B

`Cr_(2) O_(3)`

C

`Cr O_(5)`

D

`Cr_(3) O_(4)`

Text Solution

Verified by Experts

The correct Answer is:
B
`n_(Cr) = (68.4g)/(52g mol^(-1)) = 1.32, n_(O) = (31.6g)/(16g mol^(-1)) = 1.98`
`(n_(Cr))/(n_(O)) = (1.32)/(1.98) = (132)/(198) = (2xx66)/(3xx66) = (2)/(3)`
`:. EF` is `Cr_(2) O_(3)`.
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