One way in which the useful metal copper is produced is by dissolving the mineral azurite, which contains copper(II) car

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One way in which the useful metal copper is produced is by
dissolving the mineral azurite, which contains copper(II)
carbonate, in concentrated sulfuric acid. The sulfuric acid reacts
with the copper(II) carbonate to produce a blue solution of
copper(II) sulfate. Scrap iron is then added to this solution, and
pure copper metal precipitates out because of the following
chemical reaction:
Fe(s)+CuSO4(aq)→Cu(s)+FeSO4(aq)
Suppose an industrial quality-control chemist analyzes a sample
from a copper processing plant in the following way. He adds
powdered iron to a
450.mL copper(II) sulfate sample from the plant until no
more copper will precipitate. He then washes, dries, and weighs the
precipitate, and finds that it has a mass of 84.mg.
Calculate the original concentration of copper(II) sulfate in
the sample in g/L. Round your answer to 2 significant
digits