For the equilibrium, 2A + B 2C, answer the following questions. a. What compound

Question

For the equilibrium, 2A + B 2C, answer the following questions.

a. What compound(s) (A, B and/or C) will be in the numerator of the equilibrium constant expression (Keq) for this reaction?

b. What will the superscipt for A be in the equilibrium constant expression for this reaction?

c. What will the superscript for B be in the equilibrium constant expression for this reaction?

2- For the reaction A + 3B 2C,

if the initial concentration of A is 1.0M and the initial concentration of B is 1.0M and the concentration of A at equilibrium is 0.80M, what is the equilibrium constant for this reaction?

Explanation / Answer

numerator --> goes on top

for K = [product]s always go on top

so

only C will be on the numerator

b)

the superscipt of A will be n = 2, since its coefficient is 2

c)

the superscipt of B will be n = 1, since its coefficient is 1

2

initially

A = 1

B = 1

C = 0

in equilibrium

A = 1-x

B = 1-3x

C = 0+2x

and we know that

A = 0.8 = 1-x

x = 0.2

then

B = 1-3*0.2 = 0.4

C = 0+2*0.2 = 0.4

then

K = (0.4^2)/(0.8*(0.4^3)) = 3.125

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