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Chemical Equilibrium and K., Review Worksheer I 1. Write the equilibrium expression for each reaction. (a) No + O 2NO. (b) 2H + O2H0 (c) Nx + 3C5 2NCI, (d) 2Fe + 215 2Fe +1 ve 2CH.SCH+H. 2. For each reaction and their respective equilibrium constant, predict whether reactants or products are favoured. (a)N+ Ox 5 2NO K = 4.7 x 10 (b)2NO. +0= 2NO, K = 1.8 x 10 (c) NO, +CO, 5 2N + CO. K = 2.2 x 10 (d) H. + Cl2 = 2HCI K = 2.4 x 10" 2CH., SCH, +H K=9.5 x 10 3. Calculate the equilibrium constant (K.) for the following system at 250 C: PCI S PCI + CLC At equilibrium, the gases in the flask had the following concentrations: [PC1..] =0.012 mol/L, [PCI) = 0.015 mol/L, and [CI]=0.015 mol/L. 4. Methane, ethane, and hydrogen gases form the following equilibrium mixture. 2CH., 5 CH + 3H. A chemist analyzed the equilibrium mixture in a 4.0-L container at 1700 C and found 0.46 mol of CH, 0.64 mol of CH, and 0.92 mol of H. What is the value of Kat 1700C for this reaction? 5. The following reaction produces hydrogen for use as a fuel. CO+H.0, SH + CO. K = 8.3 at 700 K The reaction reaches equilibrium at 700 K in a closed 5.0-L container. Analysis shows 0.200 mol of CO, 0.230 mol of H.O. and 0.950 mol of CO,. What is equilibrium concentration of hydrogen? a + 6. At 300 K, 0.045 mol of hydrogen and flourine are placed in a closed 1.0-L container and allowed to reach equilibrium. H+F 52HF. K-4.3 at 300 K What is the equilibrium concentration of HF.? 7. The following reaction has reached equilibrium at 1100 K. He +1.5 2H1 K = 25.0 at 1100 K If 2.00 mol of Hy and I were initially placed in a 1.00-L reaction vessel, what is the equilibrium concentration of each gas? 8. At 100C, 1.50 mol/L of phosgene gas (COCI) is decomposing in a closed container based on the following chemical equation. COCIXSCO + CI. K -2.2 x 10 at 300K What is the equilibrium concentrations of Co, and CI..? 9. At a certain temperature, the equilibrium constant for the reaction between sulfur dioxide and nitrogen dioxide is 4.8. SO2 + NOX, 5 NO+SOX) The initial concentrations of So, and NOX, were 0.36 mol/L. How many moles of SO will be produced if the reaction occurs in a 5.00-L closed reaction vessel? 10. Hydrogen gas has several advantages and disadvantages as a potential fuel. Hydrogen can be obtained through the thermal decomposition of water. 2H.05 2H +0. K= 7.3 x 10" at 1000C (a) The initial concentration of water vapour in a reaction vessel is 0.055 mol/L. What is the equilibrium concentration of H., at 1000 C? (b) Comment on the practicality of the thermal decomposition of water to obtain hydrogen as a fuel. 11. In a container, carbon monoxide and water vapour are producing carbon dioxide and hydrogen at 900C. CO+H.O.SH + CO2 K= 4.00 at 900C If the concentrations at one point in the reaction are: (CO2) = 4.00 mol/L, [HO] = 2.00 mol/L. [CO] - 4.00 mol/L, and [H.] = 2.00 mol/L. Determine whether the reaction has reached equilibrium, and, if not, in which direction it will proceed to establish equilibrium + +