{"knowledge_schema": {"broad_category": "Chemistry \u2192 Organic Chemistry \u2192 Reaction Mechanisms", "refinement": "This problem involves understanding the properties and reactions of chemical substances, particularly focusing on isotopes, gas evolution, and the formation of solids and liquids during reactions.", "specific_scope": "The context revolves around the reaction of Substance Z with liquid Q, leading to the formation of gas R and solid S, and the subsequent release of compound C upon heating.", "goal": "Determine the cumulative atomic masses of the lightest and heaviest elements present in Substance Z based on the information provided."}, "summary": "This problem requires knowledge of chemical reactions and the properties of elements and compounds involved. It describes a reaction involving Substance Z, which contains a heavier isotope, and its interaction with liquid Q, resulting in gas R and solid S. The goal is to calculate the cumulative atomic masses of the lightest and heaviest elements in Substance Z, leading to the conclusion that the answer is 36."}