A0.8838-g sample of an ionic compound containing bromide ions and an unknown metal cation is dissolved in water and treated with an excess of agno3. if 1.573 g of a agbr precipitate forms, what is the percent by mass of br in the original compound?

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Explanation:

Hello,

From the AgBr precipitate, one could compute one can compute the bromine grams as follows:

As long as there was an excess of silver nitrate, one knows that into the 1.573 g of AgBr, 0.669 g correspond to the bromine that was initially contained into the 0.8838-g sample, thus, the percent is computed as follows:

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Best regards.

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