CHEM 1201 Lecture 8: Limiting Reagents

• School: LSU
• Department: Chemistry
• Course: CHEM 1201
• Professor: Kolniak

Document Summary

Chem 1201 - lecture 8 - limiting reagents. The amounts of two known reactants are given, one will be used up. The limiting reagent is completely consumed in the reaction. The limiting reagent limit"s the amount of product obtained. Therefore, at the end of reaction, those reactants present in excess will still be in the reaction mixture. Goal (#1): identify which reagent is the limiting reagent . Reagent amounts are given in gram amounts (haven"t covered molarity yet); so these values must be converted to moles via molar mass bearing in mind the stoichiometry of the reaction (most important!! The reagent with the smallest mole value, from using stoichiometry, is the limiting reagent. Multiply the moles of the limiting reagent times the molar mass of the product (and preserving stoichiometry) gives us the theoretical yield in grams. (i. e. moles x molar mass = grams).