[Chemistry]Composition of elements in empirical formula

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SUMMARY

The empirical formula of the compound C is determined to be C6H5Br based on the provided mass data. The calculations involve the conversion of the masses of carbon dioxide, water, and silver bromide into moles to derive the ratio of elements. Silver (Ag) is not included in the empirical formula due to the assumption that it is used solely for halogen determination, while oxygen is considered in excess during the analysis of carbon and hydrogen. There are no inherent restrictions on the composition of elements in an empirical formula.

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Homework Statement


0.2243 g of compound C give 0.3771 g of carbon dioxide, 0.0643 g of water and 0.2685 g of silver bromide. Determine the empirical formula of the compound.

Homework Equations


Why the empirical formula only takes C,H and Br into consideration, but singles out Ag?
Ans: C6H5Br

The Attempt at a Solution

 
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It must be because they assume you know that silver nitrate is used to determine halogens. They also assume the you have no oxygen in the compound and that oxygen is used in excess as a reagent in the C and H determination.
 
chemisttree said:
It must be because they assume you know that silver nitrate is used to determine halogens. They also assume the you have no oxygen in the compound and that oxygen is used in excess as a reagent in the C and H determination.


I see your point, thanks chemisttree
Once more question,
Will Ag be included into empirical formula at times?

In other words,
is there any restrictions in composition elements of the empirical formula?

Thanks.
 
chomool said:
is there any restrictions in composition elements of the empirical formula?

Generally speaking - no.
 

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