Problem 1- Ellingham Diagrams From the Ellingham diagram provided below, answer the following questions: What is the equilibrium partial pressure for the reaction of chromium and chromium oxide at 1200C? Mixed gas containing argon and hydrogen is often used as an atmosphere during powdered metal sintering processes to remove any oxygen present in the metal powder. If titanium powder is sintered at 1300C, what minimum ratio of hydrogen to water vapor needs to be maintained in the system to ensure deoxidation of the powders