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This quiz contains 8 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=[CH3COOC2H5][H2O][C2H5OH][CH3COOH]
Kc=[C2H5OH][H2O][CH3COOC2H5][CH3COOH]
Kc=[C2H5OH][CH3COOH][CH3COOC2H5][H2O]
Kc=[CH3COOC2H5][CH3COOH][C2H5OH][H2O]

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What does the equilibrium constant, Kc, tell us?

the concentration of reactants

the concentration of products

the rate of reaction

the relative proportions of reactants and products

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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 value of Kc has no relationship with the position of equilibrium

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

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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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Select the correct units for Kc for the following reaction:

CH3COCH3 + HCN ⇌ CH3C(CN)(OH)CH3

mol-1 dm3

mol dm-3

mol-2 dm6

mol2 dm-6

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A(g) + B(g) ⇌ C(g)

Initially there was 0.20 mol of A and 0.40 mol of B in the mixture for the reaction above. A and B reacted together to produce an equilbirium mixture containing 0.080 mol of C. The total volume of the mixture of 2.0 dm3.

Calculate the value of Kc. Give your answer to 2 significant figures.

4.2

mol-1 dm3

mol-1 dm3

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