4. (13 pts) Evaluate the range of CO and CO, ratios in gas mixtures that will precipitate graphite"snow" at 1000 K and 10 atm total pressure. Assume that there are

no other gas species. Thereaction equation is therefore1000K 2 C O(g) \stackrel{1000 K}{\Longleftrightarrow} C O_{2}(g)+C(s) \quad K=0.633 Clearly state your assumptions.