{"knowledge_schema": {"broad_category": "Chemistry \u2192 Isotopes and Reactions \u2192 Organic Chemistry", "refinement": "This problem involves understanding the properties of substances, their isotopes, and the reactions they undergo, particularly in organic chemistry contexts.", "specific_scope": "The focus is on identifying the atomic masses of elements in Substance X, which contains a heavier isotope and reacts to form specific products, including gas W and precipitate G.", "goal": "Calculate the cumulative atomic masses of the lightest and heaviest elements present in Substance X based on the information provided."}, "summary": "This problem requires knowledge of chemistry, particularly isotopes and organic reactions. It describes Substance X, which contains a heavier isotope and reacts with liquid Y to produce gas W and precipitate G. The task is to calculate the cumulative atomic masses of the lightest and heaviest elements in Substance X, considering the presence of isotopes. The answer to the question is 35, indicating the cumulative atomic mass of the relevant elements."}