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Limiting Reagent - Mole Concept Video Lecture | Physical Chemistry

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FAQs on Limiting Reagent - Mole Concept Video Lecture - Physical Chemistry

1. What is a limiting reagent in the context of the mole concept?
Ans. In the mole concept, a limiting reagent refers to the reactant that is completely consumed in a chemical reaction, thus limiting the amount of product that can be formed. It determines the maximum amount of product that can be obtained.
2. How can we identify the limiting reagent in a chemical reaction?
Ans. To identify the limiting reagent, you need to compare the mole ratio between the reactants and the products. Calculate the number of moles of each reactant and determine which reactant has the lowest mole ratio with respect to the desired product. The reactant with the lowest mole ratio is the limiting reagent.
3. What happens if there is an excess of a reactant in a chemical reaction?
Ans. If there is an excess of a reactant, it means that there is more of that reactant than what is required for complete reaction with the limiting reagent. In this case, the excess reactant will not be completely consumed and will be left over after the reaction is completed.
4. Can the limiting reagent change if the amounts of reactants are altered?
Ans. Yes, the limiting reagent can change if the amounts of reactants are altered. If the ratio between the reactants is changed, the reactant that was previously in excess may become the limiting reagent, and vice versa. It is important to recalculate the moles of each reactant whenever there are changes in the amounts.
5. How does the concept of limiting reagent affect the theoretical and actual yield of a reaction?
Ans. The concept of limiting reagent is crucial in determining the theoretical and actual yield of a reaction. The theoretical yield is the maximum amount of product that can be obtained based on the stoichiometry of the balanced equation. The actual yield, on the other hand, is the amount of product actually obtained in a laboratory setting. The actual yield is often lower than the theoretical yield due to factors such as incomplete reactions, side reactions, and experimental errors. The limiting reagent determines the extent to which the reaction can proceed and ultimately affects the actual yield.
83 videos|142 docs|67 tests
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