An unknown compound is analyzed gravimetrically and found to contain 77.6 \pm 0.1% of bromine....

Question:

An unknown compound is analyzed gravimetrically and found to contain 77.6 {eq}\pm {/eq} 0.1% of bromine. You know the initial compound could be bromide salt of sodium, potassium, or calcium. Determine the molecular formula of the initial unknown salt.

Calculating the percent mass of an element in a compound

We know that a compound is composed of 2 or more elements. To determine the percent by mass of a specific element in a compound, we determine the mass of that compound by multiplying the atomic weight with the number of atoms of that element in the compound then divide it with the molecular weight of the compound then multiply to 100.

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We know that the percent by mass of bromine in a sample is 77.6 {eq}\pm {/eq} 0.1%. To determine if the compound is a bromide salt of sodium,...

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Atomic Ratios in Compounds

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Chapter 6 / Lesson 5
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Study atomic ratios. Learn how to calculate the number of atoms in a compound, and discover how compounds are represented with empirical and molecular formulas.


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