QUESTTON Cyclohexane (C6H12) undergoes a molecular rearrangement in the presence

Question

QUESTTON Cyclohexane (C6H12) undergoes a molecular rearrangement in the presence of AICI3 to form methylcyclopentane CHaC5Ha) according to the equation: C6H12CH3C5Hg If Kc 0.143 at 25°C for this reaction, find the equilibrium concentrations of C6H12 and CH3C5Hg if the initial concentrations are 0.200 M and 0.100 M, respectively C6H12l 0.138 and [CH3C5Hgl 0.162 M C6H121 0.282 adCH3C5Hgl 0.018 M C6H121 0.0625 and [CH3C5H0.062 M [C6H12 0.262 M and [CH3C5Hgl 0.038 M QUESTION 8 po A mixture of carbon monoxide, hydrogen, and methanol is at equilibrium. The balanced chemical equation is: COG) + 2 H2(g) CH3OH(g). At 250°C, the mixture contains 0.0960 M CO, 0.191 M H2, and 0.150 M CH3OH What is the value for Kc? -2 2.33 x 10 4.09 42.8 0.244 QUESTION 9 po Which one of the following statements about the equilibrium constant, Kp, is false? An is equal to the sum of the coefficients of the gaseous products minus the sum of the coefficients of the gaseous reactants The relationship between Kp and Kc is: Kp Kc (RT) Total pressures are used in the equilibrium equation in place of molar concentrations The units for Kp are usually omitted

Explanation / Answer

Ans 7

The balanced reaction with ICE TABLE

C6H12 = CH3C5H9

I 0.200 0.100

C - x +x

E 0.200-x 0.100+x

Equilibrium constant expression of the reaction

Kc = [CH3C5H9] / [C6H12]

0.143 = [0.100+x] / [0.200-x]

0.143 [0.200-x] = [0.100+x]

0.0286 - 0.143x = 0.100 + x

1.143x = - 0.0714

x = - 0.0625

Negative sign shows that the reaction proceeds in the reverse direction.

At equilibrium

[CH3C5H9] = 0.100+x = 0.100 - 0.0625 = 0.0375 M = 0.038 M

[C6H12] = 0.200-x = 0.200 + 0.0625 = 0.2625 M = 0.262 M

Option D is the correct answer

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