Chemistry Question

Question

A + B = C + D

When 0.5 M of a is mixed with 0.5 M of B, the final concentrations of C and D are both 0.15 M. Assuming there was no starting product, calculate the value for the equilibrium constant for this reaction

Answer 1

Keq = [C][D]/[A][B]

Use an ICE table for this type of problem:

A  +  B ===> C  +  D

0.5..0.5.........0......0..... I

-x...-x..........+x......+x..C

0.5-x..0.5-x.....x.....x.....E

Final [A] = fianl [B] = 0.5-x = 0.5-0.15 = 0.35

Keq = [0.35][0.35]/[0.15][0.15]

Keq = 5.44