{"knowledge_schema": {"broad_category": "Chemistry \u2192 Stoichiometry \u2192 Gas Reactions", "refinement": "This problem involves analyzing a chemical reaction involving an equimolar mixture of two salts and the gases produced upon heating.", "specific_scope": "The focus is on determining the total number of atoms in the salts based on the mass changes observed in the gas collection tubes and the volume of gas remaining after the reaction.", "goal": "Calculate the total number of atoms in the salts X and Y by interpreting the data from the gas reactions and applying stoichiometric principles."}, "summary": "This problem is rooted in chemistry, specifically in stoichiometry and gas reactions. It describes a scenario where an equimolar mixture of two salts is heated, producing gases that interact with various substances. The changes in mass of the tubes and the volume of gas remaining provide clues to deduce the chemical composition of the salts. The goal is to calculate the total number of atoms in the salts X and Y, leading to the conclusion that the answer is 18."}