A certain reaction has the following equation A(g) ⇌ 2B(g) with a K of 6.2 × 10⁻⁵. If you start with a 4.2M concentration of A, what would be the equilibrium concentrations.
a) [A] = 0.42 M, [B] = 8.4 M
b) [A] = 0.72 M, [B] = 2.4 M
c) [A] = 0.82 M, [B] = 1.6 M
d) [A] = 0.92 M, [B] = 1.2 M