2. Calculate the equilibrium constant, Kc, for the following reactions. a. The following reaction took place in a sealed flask at 250C. PCl5(g)PCl3(g)+Cl2(g) At equilibrium, the gases in the flask had the following concentrations: [PCl]=1.2102mol/L,[PCl3]=1.5102mol/L, and [Cl2]=1.5102mol/L. What is the value of Kc at 250C ? (3 points) b. At high temperatures, carbon dioxide gas decomposes into carbon monoxide and oxygen gas. At equilibrium, the gases have the following concentrations: [CO2(g)]=1.2mol/L,[CO(g)]=0.35mol/L, and [O2(g)]=0.15mol/L. Determine Kc of the reaction. ( 3 points) c. Methane, ethyne, and hydrogen form the following equilibrium mixture. 2CH4(g)C2H2(g)+3H2(g) While studying this reaction mixture, a chemist analyzed a 4.0L sealed flask at 1700C. The chemist found 0.46mol of CH4(g),0.64mol of C2H2(g), and 0.92mol of H2(g). What is the value of Kc for the reaction at 1700C ? (4 points)