Question

PART A.Identify the proper form of the equilibrium-constant expression for the equation

N2(g)+O2(g)⇌2NO(g)

1.K=[NO][N2][O2]

2.K=[NO]2[N2][O2]

3.K=[N2][O2][NO]2

4.K=2[NO][N2][O2]

PART B. The equilibrium-constant of the reaction

NO2(g)+NO3(g)⇌N2O5(g)

is K=2.1×10−20. What can be said about this reaction?

1.At equilibrium the concentration of products and reactants is about the same.

2.At equilibrium the concentration of products is much greater than the concentration of reactants.

3.At equilibrium the concentration of reactants is much greater than that of products.

4.There are no reactants left over once the reaction reaches equilibrium.

Part C

The acid HOCl (hypochlorous acid) is produced by bubbling chlorine gas through a suspension of solid mercury(II) oxide particles in liquid water according to the equation

2HgO(s)+H2O(l)+2Cl2(g)⇌2HOCl(aq)+HgO⋅HgCl2(s)

What is the equilibrium-constant expression for this reaction?

1.K=[Cl2]2[HOCl]2

2.K=[HOCl]2[HgO⋅HgCl2][Cl2]2[H2O][HgO]2

3.K=[HOCl]2[Cl2]2

4.K=[HOCl]2[Cl2]2[H2O]

Answer 1

For a reaction with the form:

aA + bB → cC + dD

Equilibrium constant is the relationship of products and reactants expressed like this

K = [A]^a [B]^b / ( [C]^c[D]^d )

K is the equilibrium constant

Part A

products 2NO

reactants N2 and O2

Equilibrium consttant = products / reactants

Equilibrium constant = [NO]² / [N₂ ] [O₂]

Part B

The equilibrium constant is the ratio of products to reactants

if the products concentration is higher than the reactants the K constant is higher than 1

if reactants concentration is higher than that of products then k constant is < 1

since the K constant given is less than 1 then

Answer is 3.At equilibrium the concentration of reactants is much greater than that of products.

Part C

2HgO(s)+H2O(l)+2Cl2(g)⇌2HOCl(aq)+HgO⋅HgCl2(s)

K constant = HOCl² / (Cl₂)²

this is because at equilibrium the concentration of liquids and solids is equal to 1.

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