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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

In which reaction is ΔrS° expected to be negative? a. 2C2H6(g) + 7O2(g) -> 4CO2(g) + 6H2O(l) b. Ga(l) -> Ga(s) c. H2O(l) + 2SO2(g) -> H2SO4(l) d. CO2(g) -> CO2(s) e. all of above

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

Find the degree of the following polynomial    .

Which of the following is correct for the condensation of gaseous water at 88°C?  The normal boiling point of water is 100°C. a. ΔH < 0, ΔS > 0, and ΔG > 0. b. ΔH < 0, ΔS < 0, and ΔG < 0. c. ΔH > 0, ΔS < 0, and ΔG < 0. d. ΔH = 0, ΔS = 0, and ΔG < 0. e. ΔH > 0, ΔS > 0, and ΔG > 0.

What is the pH of the final solution when 25 mL of 0.021 M HCl has been added to 35 mL of 0.036 M HCl at 25°C? a. 3.3 b. 1.9 c. 1.5 d. 2.7 e. 3.5

The reaction A -> B follows first-order kinetics with a half-life of 21.7 hours. If the concentration of A is 0.023 M after 48.0 hours, what is the initial concentration of A? a. 0.0050 M b. 0.051 M c. 0.51 M d. 0.11 M e. 2.0 ´ 102 M

Nitrosyl bromide decomposes according to the chemical equation below.         2 NOBr(g) ⇌ 2 NO(g) + Br2(g) When 0.260 atm of NOBr is sealed in a flask and allowed to reach equilibrium, 22% of the NOBr decomposes. What is the equilibrium constant, Kp, for the reaction? a. 2.3 x 10–3 b. 4.5 x 10–3 c. 3.5 x 10–2 d. 4.8 x 10–2 e. 8.0 x 10–2

Which are the Brønsted–Lowry acids in the following equilibrium? CH3COO–(aq) + H2O(l)  ⇌ CH3COOH(aq) + OH–(aq) a. CH3COO– and OH– b. H2O and OH– c. H2O, CH3COOH, and OH– d. CH3COO– and CH3COOH e. H2O and CH3COOH

Who was a leading figure in the Civil Rights Movement and delivered the famous ‘I Have a Dream’ speech?