Final answer:
The question requests the equilibrium equation for the reaction between hydrogen and chlorine gases to form hydrogen chloride, but there was a typo in the provided reaction. The correct equation is H2 + Cl2 → 2 HCl, and the equilibrium constant expression is K_eq = [HCl]^2 / ([H2] × [Cl2]) with a given Keq of 4.0.
Step-by-step explanation:
Equilibrium Equation
The student appears to be asking for the equilibrium equation for a reaction involving hydrogen gas (H2) and chlorine gas (Cl2) to produce hydrogen chloride (HCl). However, there is a typo in the question. The correct balanced chemical equation for the synthesis of hydrogen chloride from its elements is:
H
2
+ Cl
2
→ 2 HCl
An equilibrium exists when the rate of the forward reaction is equal to the rate of the reverse reaction. The equilibrium constant expression (Keq) for this reaction would be:
K
eq
= [HCl]
2
/ ([H
2
] × [Cl
2
])
It is important to note that Keq is unitless and the concentrations are usually expressed in molarity (M).
In the given scenario, where the initial concentrations of both H2 and Cl2 are 1.0 M and the equilibrium constant is 4.0, the expression would be:
K
eq
= 4.0 = [HCl]
2
/ (1.0 × 1.0)
Therefore, the concentration of HCl at equilibrium can be calculated using the Keq value.