Douglasite is a mineral with the formula 2KCl. FeCl2.2H20 Calculate the mass percentage of douglasite in 445.0 mg ore if 37.20 ml of a 0.1000 M AgNO3 solution is required to precipitate all cl- as agcl

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All the elements are arranged by melting points on the periodic table. in row they go from metals to gasses. in the row from sodium to argon, sodium is more reactive than the one on its right, magnesium.

So3 that’s what i think