Constants Periodic Table You may want to reference Section 15.8 while completing

Question

Constants Periodic Table You may want to reference Section 15.8 while completing this problem. Consider the following reaction and associated equilibrium constant: Part A Kc 3.0 Find the equilibrium concentrations of A, B, and C for a = 1, b = 1, and c = 2, Assume that the initial concentrations of A and B are each 1.0 M and that no product is present at the beginning of the reaction Express your answer using two significant figures. Enter your answers separated by commas Submit Request Answer Part B Find the equilibrium concentrations of A' B, and C for a = 1' b = 1, and c = 1 . Assume that the initial concentrations of A and B are each 1.0 Mand that no product is present at the beginning of the reaction Express your answer using two significant figures. Enter your answers separated by

Explanation / Answer

part A

         A(g) +   B(g) <---> 2C(g)

initial   1 M       1 M          0

change    -x        -x           +2x

equil     1-x      1-x           2x

Kc = [C]^2/[A][B]

3 = (2X)^2/(1-X)^2

X = 0.464

[A] = 1-0.464 = 0.536 M

[B] = 1-0.464 = 0.536 M

[C] = 2*0.464 = 0.928 M

Part B

         A(g) +   B(g) <---> C(g)

initial   1 M       1 M          0

change    -x        -x           +x

equil     1-x      1-x           x

Kc = [C]/[A][B]

3 = (X)/(1-X)^2

X = 0.566

[A] = 1-0.566 = 0.434 M

[B] = 1-0.566 = 0.434 M

[C] = 2*0.566 = 1.132 M

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