How do I combine these chemical formulas to find my unknown? The iron is the caption and the chloride is the anion

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Sorry i dont understand the question can you rephase it?

Ithink the answer is 10.576

In reversible reaction chemistry equilibrium is attained when the forward and reverse reactions are taking place at the same rate, thus, the concentrations of reactants and products remain the same. a reversible reaction is a chemical reaction where the reactants form products that, in turn, react together to give the reactants back. in irreversible reactions on the other hand, the reactants react to form the products, which cannot revert back into reactants.