You are given a sample that contains a mixture of the following two arsenic-containing minerals: ruarsite (RuAsS) and orpiment (As2S3). You start with a sample of this mixture that has a mass of 87.09 grams. You perform a reaction that converts the arsenic (As) in these minerals into the form arsenic(III) oxide (As203), and 57.21 grams of this product are obtained. What is the percent by mass of ruarsite 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. Note that each time you load this page, you will get a different version of this problem. You may want to practice this problem until you can get the answer correct without using the step-by-step help.

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".