Consider this equilibrium
N2(g) + H2(g) <==> NH3(g) +94 kJ
The equilibrium law exoression for the balanced chemical equationwould be
A. [N2][H2]/[NH3]
B. [NH3]/[H2][N2]
C. [NH3]2/[H2][N2]
D. [NH3]2/[H2]3[N2]
E. 2[NH3]2/3[H2]3[N2]
The equilibrium law expression for a balanced chemical equation is given by the ratio of the products raised to their stoichiometric coefficients, divided by the ratio of the reactants raised to their stoichiometric coefficients.
In the given equation, the balanced chemical equation is:
N2(g) + 3H2(g) <==> 2NH3(g) + 94 kJ
Based on this equation, the correct equilibrium law expression is:
B. [NH3]/[H2][N2]
This expression represents the ratio of the concentration of NH3 to the product of the concentrations of H2 and N2, as given by their stoichiometric coefficients in the balanced equation.
To determine the equilibrium law expression for the balanced chemical equation, you need to use the coefficients of the balanced equation as exponents on the concentration terms.
The balanced chemical equation representing the given equilibrium is:
N2(g) + 3H2(g) ⇌ 2NH3(g) + 94 kJ
The equilibrium law expression would be based on the concentrations of the species involved. Since the coefficients in the balanced equation represent the mole ratios, the equilibrium law expression can be written as:
[A]^a [B]^b / [C]^c [D]^d
Where:
- [A] is the concentration of species A (N2 in this case).
- [B] is the concentration of species B (H2 in this case).
- [C] is the concentration of species C (NH3 in this case).
- [D] represents the concentration of any other species, if present (there are no other species in this case).
Using this information, the equilibrium law expression for the given balanced chemical equation is:
[A][B]^3 / [C]^2
Comparing this expression to the options provided:
A. [N2][H2]/[NH3]
B. [NH3]/[H2][N2]
C. [NH3]2/[H2][N2]
D. [NH3]2/[H2]3[N2]
E. 2[NH3]2/3[H2]3[N2]
The equilibrium law expression that matches our calculated expression is (C) [NH3]2/[H2][N2].
Therefore, the correct answer is C. [NH3]2/[H2][N2].
First, balance the equation.
Then Keq = (right side concns)/(left side concns), with each concn raised to a power indicated by the coefficient in the balanced equation..