Composition Determination of a Mixture
The ChemCollective   NSDL and CMU
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Composition Determination of a Mixture

You are given a sample that contains a mixture of the following two arsenic-containing minerals: and . You start with a sample of this mixture that has a mass of . You perform a reaction that converts the arsenic (As) in these minerals into the form , and grams of this product are obtained.

What is the percent by mass of in the original sample? (click here if you want step-by-step help to solve this problem)
Please, give all your calculations with three significant figures.

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