Chemistry Practice Problems The Reaction Quotient Practice Problems Solution: Consider the Haber process, 3 H2(g) + N2(g) ↔ 2 NH...

Solution: Consider the Haber process, 3 H2(g) + N2(g) ↔ 2 NH3(g). At a particular temperature, an equilibrium mixture contains 0.0030 M NH3(g), 0.10 M H2(g) and 0.090 M N2(g)? Which of the following statements best describes the reaction that will occur when(I) all 3 substances have concentrations of 0.40 M(II) all 3 substances have concentrations of 4.0 Ma. I will go to the left and II will go to the rightb. Both I and II will go to the leftc. II will go to the left and I will go to the rightd. Both I and II will go to the righte. I will go to the left and II is already at equilibrium

Problem

Consider the Haber process, 3 H2(g) + N2(g) ↔ 2 NH3(g). At a particular temperature, an equilibrium mixture contains 0.0030 M NH3(g), 0.10 M H2(g) and 0.090 M N2(g)? Which of the following statements best describes the reaction that will occur when

(I) all 3 substances have concentrations of 0.40 M

(II) all 3 substances have concentrations of 4.0 M

a. I will go to the left and II will go to the right

b. Both I and II will go to the left

c. II will go to the left and I will go to the right

d. Both I and II will go to the right

e. I will go to the left and II is already at equilibrium

Solution

Use the concept of reaction quotient and calculate for the Kc using the equilibrium concentrations and determine what will happen if all species have a concentration of 0.40 or 4.0 M for the reaction:

3 H2(g) + N2(g) ↔ 2 NH3(g)


Recall that the equilibrium constant is the ratio of the products and reactants. We use Kp when dealing with pressure and Kc when dealing with concentration:


Kp=PproductsPreactants     Kc=[products][reactants]


Note that solid and liquid compounds are ignored in the equilibrium expression.


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