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?
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?
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