Given the following reactions and their equilibrium constants:

4 A2 (s) ↔ 8 BY (g) + 12 C (g) K1 = 2698

2 X (g) ↔ BY (g) + C (g) K2 = 345



Predict the equilibrium constant for the reaction:

A2 (s) ↔ 6 X (g)



Please answer in scientific notation. Example: 4555 would be 4.555 E3