Carbon monoxide (co) reacts with hydrogen (h2) to form methane (ch4) and water (h2o).

the reaction is at equilibrium at 1,000 k. the equilibrium constant of the reaction is 3.90. at equilibrium, the concentrations are as follows.

[co] = 0.30 m
[h2] = 0.10 m
[h2o] = 0.020 m

what is the equilibrium concentration of ch4 expressed in scientific notation?