Exam 3: The Curved-Arrow Notation, Resonance, Acids and Bases, and Chemical Equilibrium

Consider this Brønsted acid-base equilibrium: 1. Fill in the structure of X; show formal charge and all valence electrons. 2. What is K_eq for this reaction for the left-to-right direction? 3. If the reaction starts out with 1 M NaOH and 0.5 M NH₃ in the solvent water (55.5 M), which species (other than water) is present in the highest concentration at equilibrium?

Complete the reaction and draw the curved-arrow notation.

Equal amount of compounds A and B (0.01 mol each) are dissolved together in 1 L of water, and this equilibrium is established: What are the major species in solution at equilibrium? (Select all that apply)

Determine the standard free-energy change of a reaction with an equilibrium constant of 250, given that 2.3RT at 298 K is 5.7 kJ mol^-1. ΔG° = ________________ kJ mol^-1.

Predict the approximate equilibrium constant (as a power of 10) for the reaction. $\left( \mathrm { CH } _ { 3 } \right) _ { 2 } \mathrm { CHCH } _ { 2 } \mathrm { SH } + \mathrm { CH } _ { 3 } \mathrm { C } \equiv \overline { \mathrm { C } } : \mathrm { Na } ^ { + } \Longrightarrow \left( \mathrm { CH } _ { 3 } \right) _ { 2 } \mathrm { CHCH } _ { 2 } \mathrm {~S} ^ { - } \mathrm { Na } ^ { + } + \mathrm { CH } _ { 3 } \mathrm { C } \equiv \mathrm { CH }$