
Interpretation: The concentration of dinitrogen tetroxide has to be calculated.
Concept introduction: For a balanced
aA+bB⇌cC+dD
The equilibrium expression is ratio of the concentration of the products to the concentration of the reactants. The concentration of each reactant/product is raised to a power corresponding to their coefficient in the balanced equation.
The law of
K=[C]c[D]d[A]a[B]b
The equilibrium constant is represented as K.

Answer to Problem 44A
The concentration of dinitrogen tetroxide is 5.4×10-4 M.
Explanation of Solution
The given chemical reaction is,
N2O4(g)⇌2NO2(g)
Given data,
The equilibrium concentration of [NO2] is 0.0021 M.
The equilibrium constant is 8.1×10-3.
For a balanced chemical reaction,
aA+bB⇌cC+dD
Where,
- A,B,C,D are chemical species.
- a,b,c and d are coefficients in the balanced equation.
The equilibrium expression is given as,
K=[C]c[D]d[A]a[B]b
Where,
K is the value of equilibrium constant.
For the given reaction, the expression for equilibrium constant is written as,
K=[NO2]2[N2O4]
Substitute the values of equilibrium concentration of nitrogen dioxide and equilibrium constant in the above expression,
K=[NO2]2[N2O4](8.1×10-3)=(0.0021)2[N2O4]N2O4=5.4×10-4 M
The concentration of dinitrogen tetroxide is 5.4×10-4 M.
The concentration of dinitrogen tetroxide is 5.4×10-4 M.
Chapter 17 Solutions
World of Chemistry, 3rd edition
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