1. Consider the reaction for the production of ammonia from nitrogen and hydroge

Question

1.       Consider the reaction for the production of ammonia from nitrogen and hydrogen.

N2(g)+ 3 H2(g) D 2 NH3(g)          

a)       The initial concentration of NH3 is 10 M and its equilibrium concentration is 2 M, how is the change is the concentration of NH3 calculated? Explain

b)      Explain how the stoichiometry coefficients on the balanced equation are used to determine the change in concentration for N2 and H2 if from the change in concentration for NH3?

c)       How are the equilibrium concentrations of N2 and H2 calculated? Explain

Explanation / Answer

a)

[NH3] = 10

in eq

[NH3]= 2

the change of NH3 can be calcualte as follows:

NH3 final = NH3initial - NH3 change

NH3change = NH3initial - NH3final

NH3 change = (10-2) = 8 M of NH3 has reacted

b)

the previous was done for NH3

we can relat NH3 with respect to N2 and H2 as follow

[H2] = 0 + 3x

[N2] = 0 +x

and x is the extent of reaction

so

[NH3] = 10 - 2x = 8

x = (8-10)/-2) = +1

c)

in equilbrium

[H2] = 0 + 3x = 3

[N2] = 0 +x = 1

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