November 28, 2021, 06:25:53 AM
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Topic: Composition Determination of a Mixture  (Read 621 times)

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Offline John11

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Composition Determination of a Mixture
« on: June 22, 2021, 02:50:35 AM »
You are given a sample that contains a mixture of the following two arsenic-containing minerals: paakkonenite (Sb2AsS2) and orpiment (As2S3). You start with a sample of this mixture that has a mass of 98.49 grams. You perform a reaction that converts the arsenic (As) in these minerals into the form calcium arsenate (Ca3(AsO4)2), and 62.46 grams of this product are obtained.
What is the percent by mass of paakkonenite in the original sample?

I don't understand the steps that need to be taken in order to solve this problem. Any help or clarity is appreciated.

Offline Borek

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Re: Composition Determination of a Mixture
« Reply #1 on: June 22, 2021, 12:48:15 PM »
Please read the forum rules. You have to show your attempts at answering the question/solving the problem to receive help, it is a forum policy.

Hint: you have two unknowns: mass of paakkonenite and orpiment. Information given allows you to write two equations.
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Offline Orcio_Dojek

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Re: Composition Determination of a Mixture
« Reply #2 on: June 25, 2021, 03:58:23 PM »
@John11

I would start with writing two equations.

1. how much Ca3(AsO4)2 I will get from 98,49 g of Sb2AsS2 + how much Ca3(AsO4)2 I will get from 98,49 g of As2S3.

2. mixture cointains only Sb2AsS2 and As2S3 (they give 100 % in all).

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