For the reaction: 2 A (g) + B (s) = 2 C (s) + D (g)
At 298 K in a 10.0 L vessel, the equilibrium values are as follows:
0.721 atm of A, 4.18 mol of B, 6.25 mol of C, and 4.02 atm of D.
What is the value of the equilibrium constant?