The bromide impurity in a 2.00 g sample ...

The bromide impurity in a `2.00` g sample of a metal nitrate is precipitated as silver bromide. If `6.40` mL of `0.200"M AgNO"_(3)` solution is required, what is the mass percentage of bromide in the sample?

`1.28`

`2.56`

`5.11`

`9.15`

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