Question

It is possible to predict the equilibrium constant of a reaction by combining two or more reactions for which the value of K is known. When combining equilibrium constants, it is important to note the following: When a reaction is reversed, its Kvalue is inverted; that is, Kreverse=1/Kforward. When the coefficients of a reaction are multiplied by a factor, the K value is raised to the power of that factor. When reactions are added, their Kvalues are multiplied.

Part A Determine the value of the equilibrium constant, Kgoal, for the reaction N2(g)+O2(g)+H2(g)⇌12N2H4(g)+NO2(g),    Kgoal=? by making use of the following information: 1. N2(g)+O2(g)⇌2NO(g),       K1 = 4.10×10−31 2. N2(g)+2H2(g)⇌N2H4(g),       K2 = 7.40×10−26 3. 2NO(g)+O2(g)⇌2NO2(g),       K3 = 6.00×10−13 Express your answer numerically. Part B Determine the equilibrium constant, Kgoal, for the reaction 4PCl5(g)⇌P4(s)+10Cl2(g),    Kgoal=? by making use of the following information: P4(s)+6Cl2(g)⇌4PCl3(g),       K1=2.00×1019 PCl5(g)⇌PCl3(g)+Cl2(g),       K2=1.13×10−2 Express your answer numerically.

Answer 1