This problem considers the equilibrium composition of a mixture consisting initially of CO and H₂O, and is an important metallurgical system. The species considered at equilibrium are CH₄, CO, CO₂, H₂, H₂O, all in the gas phase, and C(s). The goal is to calculate the equilibrium distribution as a function of temperature and H₂O:CO feed ratio. It is particularly important to locate the parameter boundaries which lead to soot (C(s)) formation.

This problem is included as an example in all versions of EQS4WIN. In the initial form of the problem, the H₂O:CO ratio is varied from 0 to 2, and the temperature range 400^oC-1200^oC is considered.