K_c Is 1

question 41

Multiple Choice

K_c is 1.67 × 10²⁰ mol³ L^-3 at 25 °C for the formation of iron(III) oxalate complex ion: Fe³⁺(aq) + 3C₂O₄^2-(aq) ⇌ [Fe(C₂O₄) ₃]^3-(aq)
If 0.0200 mol L^-1 Fe³⁺ is initially mixed with 1.00 mol L^-1 oxalate ion, what is the concentration of Fe³⁺ ion at equilibrium?

• A)1.44 × 10^-22 mol L^-1
• B)0.0100 mol L^-1
• C)8.35 × 10¹⁹ mol L^-1
• D)6.94 × 10²¹ mol L^-1

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