Assuming the following reaction proceeds in the forward direction,         Fe3+(aq) + Co(s) -> Fe2+(aq) + Co2+(aq) a. Fe3+(aq) is oxidized and Co(s) is reduced. b. Fe3+(aq) is oxidized and Co2+(aq) is reduced. c. Co(s) is oxidized and Fe3+(aq) is reduced. d. Co(s) is oxidized and Co2+(aq) is reduced. e. Fe2+(aq) is oxidized and Co(s) is reduced.

The standard free energy change for a chemical reaction is +13.3 kJ/mol. What is the equilibrium constant for the reaction at 125 °C?  a. 2.8 x 10–6 b. 2.0 x 10–5 c. 4.7 x 10–3 d. 3.8 x 10–2 e. 1.8 x 10-2

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What is ΔrG° at 500.0 K for the following reaction? Zn(s) + H2O(g) -> ZnO(s) + H2(g) Substance ΔfH°(kJ/mol-rxn) at 298 K S° (J/K·mol-rxn) at 298 K Zn(s) 0 41.6 H2O(g) –241.8 188.7 ZnO(s) –350.5 43.7 H2(g) 0 130.6   a. 80.7 kJ/mol-rxn b. –80.7 kJ/mol-rxn c. 92.0 kJ/mol-rxn d. –92.0 kJ/mol-rxn e. –136.7 kJ/mol-rxn

What is the pH of the solution which results from mixing 75 mL of 0.50 M NH3(aq) and 75 mL of 0.50 HCl(aq) at 25 °C? (Kb for NH3 = 1.8 x 10–5) a. 0.60 b. 2.67 c. 4.74 d. 4.93 e. 9.26

What is the pH of a 0.28 M solution of sodium propionate, NaC3H5O2, at 25°C? (propionic acid, HC3H5O2, is monoprotic and has a Ka = 1.3 x 10–5 at 25°C.) a. 6.26 b. 7.83 c. 8.10 d. 8.74 e. 9.17

Write a balanced half-reaction for the reduction of CrO42–(aq) to Cr(OH)3(s) in a basic solution. a. CrO42–(aq) + 3 OH–(aq) + 3 e– -> Cr(OH)3(s) + 2 O2(g) b. CrO42–(aq) + 3 H+(aq) + 3 e– -> Cr(OH)3(s) c. CrO42–(aq) + 3 H+(aq) -> Cr(OH)3(s) + 2 e– d. CrO42–(aq) + 4 H2O(l) + 3 e– -> Cr(OH)3(s) + 5 OH–(aq) e. CrO42–(aq) + 3 OH–(aq) -> Cr(OH)3(s) + 2 O2(g)

If 25 mL of 0.750 M HCl are added to 100. mL of 0.392 M NaOH, what is the final pH? a. 13.21 b. 2.79 c. 13.50 d. 1.50 e. 11.25

Estimate the boiling point of ethanol given the following thermodynamic parameters.       C2H5OH(l) C2H5OH(g)   ΔfH° (kJ/mol) –277.0 –235.3   S° (J/K×mol) 160.7 282.7   ΔfG° (kJ/mol) –174.7 –168.5   a. 290 °C b. 144 °C c. 51 °C d. 69 °C e. 342 °C

Simplify   . Assume the denominator is not equal zero.