Limiting reagent question

[dnovikov]

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The way TBR explains limiting reagents is a bit confusing. They state, " If the ratio of the moles of Reactant A to Reactant B is greater than the ratio of Reactant A to Reactant B from the balanced equation, then Reactant B is the limiting reagent. If the ratio of the moles of Reactant A to Reactant B is less than the ratio of Reactant A to Reactant B from the balanced equation, then Reactant A is the limiting reagent."

This whole bit confused me... If anyone can provide a more clear explanation of how to figure out which reactant is the limiting reagent that would be awesome! Thanks!

 

[mcloaf]

The way TBR explains limiting reagents is a bit confusing. They state, " If the ratio of the moles of Reactant A to Reactant B is greater than the ratio of Reactant A to Reactant B from the balanced equation, then Reactant B is the limiting reagent. If the ratio of the moles of Reactant A to Reactant B is less than the ratio of Reactant A to Reactant B from the balanced equation, then Reactant A is the limiting reagent."

This whole bit confused me... If anyone can provide a more clear explanation of how to figure out which reactant is the limiting reagent that would be awesome! Thanks!

Well, you just have to convert whatever values they give you moles and then compare them to the stoichiometry for the reaction you're examining.

So if they gave you:

2A + B ---> C

Your stoichiometric ratio of A:B is 2:1. If you calculate the ratio based the values of for A and B that they give you in the problem and your ratio is higher than 2:1, you have too much A and B will be the limiting reagent. If it's the opposite and the ratio is too low, well then you'll need more of A to react with all of your B to completion.

 

[Temperature101]

The way TBR explains limiting reagents is a bit confusing. They state, " If the ratio of the moles of Reactant A to Reactant B is greater than the ratio of Reactant A to Reactant B from the balanced equation, then Reactant B is the limiting reagent. If the ratio of the moles of Reactant A to Reactant B is less than the ratio of Reactant A to Reactant B from the balanced equation, then Reactant A is the limiting reagent."

This whole bit confused me... If anyone can provide a more clear explanation of how to figure out which reactant is the limiting reagent that would be awesome! Thanks!

EK do a better job of explaining limiting reagent...If you also have an EK book, use it for this particular concept.