1, Calculate Kefor the following (equilibrium concentrations given belowsubstanc

Question

1,         Calculate Kefor the following (equilibrium concentrations given belowsubstances)

a)      4NH3 (g)    +     3 O2(g)          2N2 (g)     +    6 H2O (g)    +     heat

         [0.010]         [0.10]               [0.0794]         [0.10]

b)      N2(g)     +     3H2 (g)    +    heat          2NH3 (g)

         [0.103]       [0.240]                     [0.0114]

c)      H2(g)     +    Cl2 (g)         2 HCl(g)     +     heat

         [0.21]                  [0.22]                      [0.784]

2.         For allthree of the equilibria in problem #1 predict (1) how Ke isaffected by an decrease in temperature, (2) predict how theequilibrium will shift when pressure is increased, (3) predict howthe equilibrium will shift when the concentration of the underlinedsubstance is increased, and (4) predict how the equilibrium willshift when the temperature is increased.

Explanation / Answer

The equilibrium constant is calculated by dividing theconcentration of the products (multiplied together) by theconcentration of the reactants (multiplied together). Thecoefficients in the original equation become exponents in theequilibrium constant equation. 1a. ([.1]^6 * [.0794]^2)/([.10]^3 * [.010]^4) = 630.436 Ke=630 b. ([.0114]^2)/([.103] * [.240]^3) = .091272249 Ke=.0913 c. ([.784]^2)/([.22] * [.21]) = 13.30424242 Ke=13 To figure out how pressure, temperature, concentration, etc.affects equilibrium, use Le Chatelier's principle. Here's a goodexplanation if you are confused:http://www.ausetute.com.au/lechatsp.html 2a. 1. Ke will increase. 2. Equilibrium will shift toward the left/favor the reversereaction. 3. Equilibrium will shift toward the right/favor the forwardreaction. 4. Equilibrium will shift toward the left/favor the reversereaction. 2b. 1. Ke will decrease. 2. Equilibrium will shift toward the right/favor the forwardreaction. 3. Equilibrium will shift toward the left/favor the reversereaction. 4. Equilibrium will shift toward the right/favor the forwardreaction. 2c. 1. Ke will increase. 2. Will not change. 3. Equilibrium will shift toward the left/favor the reversereaction. 4. Equilibrium will shift toward the left/favor the reversereaction.

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