Consider the reaction below.

H2(g) + CO2(g) Right arrow. H2O(g) + CO(g)

At equilibrium at 600 K, the following are true.

[CO2] = 9.5 x 10-4 M
[H2] = 4.5 x 10-2 M
[H2O] = 4.6 x 10-3 M
[CO] = 4.6 x 10-3 M

What is the value of the equilibrium constant for this reaction in correct scientific notation?
4.9 x 10-3
4.9 x 10-2
4.9 x 10-1
4.9 x 103