1. The problem statement, all variables and given/known data The problem is in the attached picture. I simply do not know what an "equilibrium equation" is and what it means by the composition. My professor is unbelievably difficult to get a straight, understandable answer from. I've already taken thermodynamics, but we did not learn about coal gasifiers. 2. Relevant equations k = (ycc * ydd) / (yaa * ybb) when P = Patm 3. The attempt at a solution I believe that the boxed in equations are the answers to part (a), the "independent reaction equations" and there would be 2 of them. My teacher made it sound like these were also the "equilibrium equations" as the answer for part (b), but then where would the "composition" come from? I believe that the equilibrium equation would be something like this: (y/2) O2 + (y) C + x H2O --> aCH4 + bH2 + cH2O + dCO + eCO2 And then the composition would be the coefficients, but my teacher made me believe that this was incorrect. Can someone give an example of what an "equilibrium equation" is? I know there is something called the "equilibrium constant", which he gave us a handout to find values for, but I have no clue how to use it. Then I will attempt to solve for the equilibrium equation and the composition of this one and then check back in. Thanks!