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Tell me which reactant is limiting, the theoretical yield of AgCl in grams, and how much excess is left."},{"title":"Percent yield calculation from lab results","prompt":"I ran a reaction with 5 grams of H2 (coefficient 2) and 32 grams of O2 (coefficient 1) to produce H2O (coefficient 2), and I actually collected 38 grams of water. What's my percent yield and theoretical yield?"},{"title":"Classroom stoichiometry homework check","prompt":"For the combustion of methane — CH4:1:8;O2:2:16 producing CO2:1 — which reactant is the limiting reagent and how many grams of CO2 can theoretically be produced?"}],"resultDescription":"Returns a structured object identifying the limiting reagent by formula, the theoretical yield of the specified product in both grams and moles, and per-reactant details including grams given, grams used, grams left over, moles given, moles used, moles left over, stoichiometric coefficient, and reaction extent. If actual product mass is supplied, percent yield is also returned. A human-readable summary and list of reasoning steps are included.","failureModes":["Missing or malformed reactants/product query parameters returns an error","Unrecognized chemical formula (e.g. typo in element symbol) causes a parse failure","Stoichiometrically unbalanced equation may produce incorrect or flagged results","Zero or negative gram values may cause computation errors","actualGrams provided without valid reactants/product will still fail if core params are missing"],"whenToPreferThis":"Use this endpoint when you need to perform stoichiometric analysis on a balanced chemical reaction — specifically to identify the limiting reagent, compute theoretical yield, quantify excess reagents, or calculate percent yield from experimental data. 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