At 445oC, Kc for the following reaction is 0.020. 2 HI(g) <--> H2 (g) + I2 (g) A mixture of H2, I2, and HI in a vessel at 445oC has the following concentrations: [HI] = 1.5 M, [H2] = 2.50 M and [I2] = 0.05 M. Which one of the following statements concerning the reaction quotient, Qc, is TRUE for the above system? a. Qc = Kc; the system is at equilibrium.
b. Qc is less than Kc; more H2 and I2 will be produced.
c. Qc is less than Kc; more HI will be produced.
d. Qc is greater than Kc; more HI will be produced.

Explanation:

The given balanced chemical equation is:

The value of Kc at 445oC is 0.020.

[HI]=1.5M

[H2]=2.50M

[I2]=0.05M

The value of Qc(reaction quotient ) is calculated as shown below:

Qc has the same expression as the equilibrium constant.

Qc>Kc,

Hence, the backward reaction is favored and the formation of Hi is favored.

Among the given options, the correct answer is option d. Qc is greater than Kc; more HI will be produced.

An atom's coordination number in a molecule refers to the number of atoms attached with the central atom. The coordination number in chemistry illustrates the number of neighbor atoms in regard to a central atom. The coordination number can differ from as low as two to as high as sixteen. The value of the coordination number relies upon the comparative sizes of the central atoms and the ligands and by the charge from the ion's electronic configuration.  

The NH₃ is a neutral ligand. Thus, the formula for a complex produced in between Ni²⁺ and NH₃ with a coordination number 5 will be [Ni(NH₃)₅]²⁺.