Other
determining_limiting_and_excess_regents
- Course
- Institution
Determining_limiting_and_excess_regents worksheet
[Show more]
Seller
Follow
bernicekatako
Content preview
DETERMINING LIMITING AND EXCESS REAGENTSThese problems are a more real-world application of the stoichiometry practice,
as typically one reactant will be consumed, leading the reaction to also stop.
Limiting Reagent
The limiting reagent in a chemical reaction is the reactant that will be
consumed completely. Once there is no more of that reactant, the reaction
cannot proceed. Therefor it limits the reaction from continuing.
Excess Reagent
The excess reagent is the reactant that could keep reacting if the other had not
been consumed.
Examples
1. Let’s start with a non-chemistry example that may make more sense.
• Making a car is a lot more complicated than four wheels and a
steering wheel, but let's say that it’s all it takes.
o You have 400 wheels and 125 steering wheels, which will you run
out of first? How many of the other will be left over?
• The way that it is best approached is finding out how many cars would
be made based on each “reactant.”
1 𝑐𝑎𝑟
400 𝑤ℎ𝑒𝑒𝑙𝑠 ∗ = 100 𝑐𝑎𝑟𝑠
4 𝑤ℎ𝑒𝑒𝑙𝑠
1 𝑐𝑎𝑟
125 𝑠𝑡𝑒𝑒𝑟𝑖𝑛𝑔 𝑤ℎ𝑒𝑒𝑙𝑠 ∗ = 125 𝑐𝑎𝑟𝑠
1 𝑠𝑡𝑒𝑒𝑟𝑖𝑛𝑔 𝑤ℎ𝑒𝑒𝑙
• Because there are only enough wheels to create 100 cars, but the
steering wheels can create 125 cars, the wheels are the limiting
reagent. It is important to notice that the limiting reagent can be
the reactant, which had more in the beginning. To find the amount of
the excess (steering wheels), we need to find the amount needed to
create the 100 cars.
1 𝑠𝑡𝑒𝑒𝑟𝑖𝑛𝑔 𝑤ℎ𝑒𝑒𝑙
100 𝑐𝑎𝑟𝑠 ∗ = 100 𝑠𝑡𝑒𝑒𝑟𝑖𝑛𝑔 𝑤ℎ𝑒𝑒𝑙𝑠
1 𝑐𝑎𝑟
• Thus, we need 100 steering wheels to use up all the wheels.
125 𝑠𝑡𝑒𝑒𝑟𝑖𝑛𝑔 𝑤ℎ𝑒𝑒𝑙𝑠 𝑡𝑜 𝑠𝑡𝑎𝑟𝑡 − 100 𝑠𝑡𝑒𝑒𝑟𝑖𝑛𝑔 𝑤ℎ𝑒𝑒𝑙𝑠 𝑛𝑒𝑒𝑑𝑒𝑑
= 25 𝑠𝑡𝑒𝑒𝑟𝑖𝑛𝑔 𝑤ℎ𝑒𝑒𝑙𝑠 𝑖𝑛 𝑒𝑥𝑐𝑒𝑠𝑠
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller bernicekatako. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $2.81. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
52928 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now