In the Coal-Gasification Process, Carbon Monoxide Is Converted to Carbon

Multiple Choice

In the coal-gasification process, carbon monoxide is converted to carbon dioxide via the following reaction: CO (g) + H₂O (g) CO₂ (g) + H₂ (g)
In an experiment, 0.35 mol of CO and 0.40 mol of H₂O were placed in a 1.00-L reaction vessel. At equilibrium, there were 0.22 mol of CO remaining. K_eq at the temperature of the experiment is ________.

A) 5.5
B) 0.75
C) 3.5
D) 0.28
E) 1.0