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This quiz contains 7 questions from a mix of 1 subtopics.

Select the correct Kc expression for the following reaction:

C2H5OH(aq) + CH3COOH(aq) ⇌ CH3COOC2H5(aq) + H2O(aq)

Kc​=[C2​H5​OH][H2​O][CH3​COOC2​H5​][CH3​COOH]​
Kc​=[C2​H5​OH][CH3​COOH][CH3​COOC2​H5​][H2​O]​
Kc​=[CH3​COOC2​H5​][H2​O][C2​H5​OH][CH3​COOH]​
Kc​=[CH3​COOC2​H5​][CH3​COOH][C2​H5​OH][H2​O]​

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What does the equilibrium constant, Kc, tell us?

the concentration of products

the relative proportions of reactants and products

the rate of reaction

the concentration of reactants

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A Kc value greater than indicates a position of equilbrium that is towards the products.

one

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What is the relationship between the value of Kc and the position of equilibrium?

the larger the value of Kc, the further the position of equilibrium lies to the left-hand side

the larger the value of Kc, the further the position of equilibrium lies to the right-hand side

the value of Kc has no relationship with the position of equilibrium

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Calculate the value of Kc, to 3 significant figures, for the following equilibrum:

H2(g) + I2(g) ⇌ 2HI(g)

The equilbrium concentrations are:

  • [H2] = 4.00 x 10-4 mol dm-3
  • [I2] = 6.00 x 10-4 mol dm-3
  • [HI] = 1.14 x 10-3 mol dm-3
5.42

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Calculate the value of Kc, to 3 significant figures, for the following equilibrum:

N2(g) + 3H2(g) ⇌ 2NH3(g)

The equilbrium concentrations are:

  • [N2] = 10.0 mol dm-3
  • [H2] = 0.100 mol dm-3
  • [NH3] = 0.750 mol dm-3
56.3

mol-2 dm6

mol-2 dm6

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If Kc for a reaction is much greater than 1, what can be said about the position of equilibrium?

the equilibrium position cannot be determined

products predominate over reactants

reactants predominate over products

the equilibrium position is in the middle

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