Question

Part A

Part complete

Cyclohexane, C₆H₁₂, undergoes a molecular rearrangement in the presence of AlCl₃ to form methylcyclopentane, CH₃C₅H_9, according to the equation:

C₆H₁₂ ↔ CH₃C₅H₉

If K _c = 0.143 at 25°C for this reaction, find the equilibrium concentrations of C₆H₁₂ and CH₃C₅H₉ if the initial concentrations are 0.200 M and 0.050 M, respectively.

[C6H12] = 0.181 M, [CH3C5H9] = 0.069 M

[C6H12] = 0.224 M, [CH3C5H9] = 0.026 M

[C6H12] = 0.019 M, [CH3C5H9] = 0.019 M

[C6H12] = 0.219 M, [CH3C5H9] = 0.031 M

Part B

Part complete

The reaction 3 A(g) + B(g) ↔ C(g) has an equilibrium constant of 7.50 x 10² at 150°C. If the initial concentrations are [A] = 0.150 M, [B] = 0.225 M, and [C] = 0.650 M, which of the following statements is true?

Cannot be predicted.

The system is at equilibrium and will not shift in either direction.

The system is not at equilibrium and will shift to the right to establish equilibrium.

The system is not at equilibrium and will shift to the left to establish equilibrium

Part C

Determine the value of K_c for the following reaction if the equilibrium concentrations are as follows: [PCl₅]_eq = 0.56 M, [PCl₃]_eq = 0.23 M, [Cl₂]_eq = 4.4 M.

PCl₅(g) ↔ PCl₃(g) + Cl₂(g)

0.76

0.55

1.8

1.1

0.93

Answer 1