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I am unsure of how to approach this question, any help would be greatly appreciated!

"2.085g of PCl5 were heated to 250°C in a 500mL vessel:
PCl5 (g) ⇌ PCl3 (g) + Cl2 (g)

Calculate the initial concentration of PCl5. At equilibrium the concentration of the chlorine is 0.018 mol L-1."

  • Chemistry -

    This is a weirdo question. The initial concn is
    mols PCl5 = grams/molar mass
    M = mols/0.500 = ?
    The other numbers are not needed. They would be needed if you wanted the equilibrium concn of PCl5.

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