Douglasite is a mineral with the formula 2 KCl·FeCl2·2 H2O. Calculate the mass percent of douglasite in a 503.0 mg sample if it took 37.20 mL of a 0.1000 M AgNO3 solution to precipitate all of the Cl- as AgCl. Assume the douglasite is the only source of chloride ion.
What I thought I had to do was find the moles of AgNO3. After I had the moles though, I wasn't sure what to do. Multiply it with the molar mass of douglasite? What's a mass percent? I thought it was only for one element in a whole formula, so I'm getting confused when they're asking for the mass percent of douglasite.
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Topic: Mass Percent problem (Read 4756 times)