Answer:
Most interactions among atoms take place in the outermost shell of each atom. The number of each electron in this shell determines how an atom combines with other atoms to form compounds. When atoms combine they gain, lose or share electrons in such a way that the outer shells become chemically complete.
Explanation:
Answer:
![[HCl]_{eq}=0.05M](https://tex.z-dn.net/?f=%5BHCl%5D_%7Beq%7D%3D0.05M)
Explanation:
Hello,
In this case, for the given chemical reaction, the law of mass action at equilibrium results:
![Kc=\frac{[H_2]_{eq}[Cl_2]_{eq}}{[HCl]^2_{eq}}](https://tex.z-dn.net/?f=Kc%3D%5Cfrac%7B%5BH_2%5D_%7Beq%7D%5BCl_2%5D_%7Beq%7D%7D%7B%5BHCl%5D%5E2_%7Beq%7D%7D)
Next, in terms of the change 
due to reaction extent, it is rewritten, considering an initial concentration of HCl of 0.25M (1mol/4L), as:
Thus, solving for via quadratic equation or solver, the following results are obtained:
Clearly, the solution is 
as the other result will provide a negative concentration for the hydrochloric acid at equilibrium, thereby, its equilibrium concentration turns out:
![[HCl]_{eq}=0.25M-2*0.1M](https://tex.z-dn.net/?f=%5BHCl%5D_%7Beq%7D%3D0.25M-2%2A0.1M)
Best regards.
