The absorbance of an equilibrium mixture containing FeSCN2+ was measured at 447nm and found to be 0.317. What is the equilibrium concentration of FeSCN2+?

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9. 4.75 mL of H₂O and 3.25 mL of an aqueous 0.030 M SCN^- solution were added to 10.00 mL of an aqueous 0.020 M Fe³⁺ solution. The total volume of the solution is 18.00 mL. What is the diluted Fe³⁺ concentration?

[Fe³⁺]_diluted = M

10. A standard reference FeSCN²⁺ solution (0.010 M) has an absorbance = 1.010. What is the concentration of an unkown FeSCN²⁺ solution that has an absorbance = 0.365.

unknown [FeSCN²⁺] = M

11. Consider the following equilibrium:
Fe³⁺(aq) + SCN^-(aq) ? FeSCN²⁺(aq)

Initial concentrations: [Fe³⁺] = 0.480; [SCN^-] = 1.008; [FeSCN²⁺] = 0

The equilibrium concentration of [FeSCN²⁺]_eq = 0.370 M.

What is the equilibrium concentration of Fe³⁺?

[Fe³⁺]_eq = M

12. Consider the following equilibrium:
Fe³⁺(aq) + SCN^-(aq) ? FeSCN²⁺(aq)

Initial concentrations: [Fe³⁺] = 0.590; [SCN^-] = 1.239; [FeSCN²⁺] = 0

The equilibrium concentration of [FeSCN²⁺]_eq = 0.454 M.

What is the numerical value of K_C for this equilibrium?

K_C =

1) Consider the following equilibrium: Fe3+(aq) + SCN-(aq) â FeSCN2+(aq) Initial concentrations: [Fe3+] = 0.590; [SCN-] = 1.239; [FeSCN2+] = 0 The equilibrium concentration of [FeSCN2+]eq = 0.454 M. What is the numerical value of KC for this equilibrium? KC = __________________

2) Consider the following equilibrium: Fe3+(aq) + SCN-(aq) â FeSCN2+(aq) Initial concentrations: [Fe3+] = 0.370; [SCN-] = 0.777; [FeSCN2+] = 0 The equilibrium concentration of [FeSCN2+]eq = 0.285 M. What is the equilibrium concentration of Fe3+? [Fe3+]eq = _____________M

3) When the kinetic data is correctly plotted to determine the activation energy, Ea, for a chemical reaction, the slope for the straight line graph is found to be -4900. What is the activation energy, Ea, in kJ/mol? Enter your answer as a POSITIVE number. Ea = __________________kJ/mol

4) A standard reference FeSCN2+ solution (0.040 M) has an absorbance = 0.815. What is the concentration of an unkown FeSCN2+ solution that has an absorbance = 0.288. unknown [FeSCN2+] = _________ M

5) 4.00 mL of H2O and 4.00 mL of an aqueous 0.040 M SCN- solution were added to 13.50 mL of an aqueous 0.025 M Fe3+ solution. The total volume of the solution is 21.50 mL. What is the diluted Fe3+ concentration?

Fe3+(aq) + SCN-(aq) ---> FeSCN2+(aq)

Initial concentration of Fe3+ and SCN- are both 1.00e-3 M. FeSCN2+ initial concentration = 0.

Determine the equilibrium concentrations given the absorbance of trial 1 is .551 and the molar absorpitivity constant is 5640.

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The absorbance of an equilibrium mixture containing FeSCN2+ was measured at 447nm and found to be 0.317. What is the equilibrium concentration of FeSCN2+?

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