Question

Question 5: (1 point) At 390 K, the equilibrium constant, K., for the reaction below is 1.8 x 10-?. PCIs (g) - PC1; (g) + Cl2 (g) Assume a quantity of PCIs (g) is placed in a rigid 10 L vessel and the system is allowed to reach equilibrium at a constant temperature of 390 K. Identify whether each of the following statements is true or false. At equilibrium, if the vessel contains I mole of PCs (g) it must contain 0.0428 mol Cl, (g) and 0.0428 mol PCI(g). (a) TRUE (b) FALSE If some of the equilibrium mixture is removed, a new equilibrium mixture will eventually form and the concentrations of the three components will be less than for the original equilibrium mixture. (a) TRUE (b) FALSE When the volume is halved the number of moles of Cl, and PCI, will decrease until equilibrium is reached (a) TRUE (b) FALSE If the volume of the vessel is doubled, the value of the reaction quotient, , immediately after the change in volume will be 3.6 x 10. (a) TRUE (b) FALSE Higher equilibrium concentrations of Cl, and PCI, will result if an inert gas is added to the vessel. (a) TRUE (b) FALSE

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Answer 1

5.970 mol_519M A(g) + B2 (8) 1) Initial concentration of AB = 1.15L The ICE table constructed is as follows: 2AB(g) 2 Initial (M) 5.19 Change(M): - 2x Equil(M): 5.19-2x +x 0.457 mol We have been given, [AZ].m = (x) M => -= 0.397 M 1.15 L = x = 0.397 Equilibrium concentration of AB,[AB] = (5.19-2(x))M =(5.19-2(0.397 ) M = 4.396 M Equilibrium concentration of B2, [B2] = (x) M = 0.397 M , (A [B2] Equilibrium constant, K = ! TAB (0.397)(0.397) (4.396) = 0.00816 x 8.16x10-3