Stoichiometry Summary

I thought this unit was pretty simple in comparison to the last few units because this unit was more of an application of all the previous knowledge that we had and really the only new things we learned were the processes to solve certain problems. All the problems mostly consisted of the same basic process of starting with a balanced equation and went from converting to moles, to using the balanced equation ratio and then converting back to grams if necessary.

We can use the above process to find the mass or moles of any reactant or product in the balanced chemical equation if we are given a mass of a product or reactant to begin with. 

Example: What number of moles of O2 would be produced by the decomposition of 13 grams of water.

More practice: 

• http://www.chemistry.wustl.edu/~coursedev/Online%20tutorials/Plink/Stoichiometry/stoichset.htm
• http://science.widener.edu/svb/tutorial/genstoichiometrycsn7.html

Limiting Reagent

Limiting reagent- the reactant that is completely used up when a reaction is run to completion

To find the limiting reagent we can run both reactions to find the amount of one product and the reactant that produces the least amount of product is the limiting reagent. 

We can then use that to figure out how much product will actually be created (which will be the product created with the calculation of the limiting reagent)

Practice: 

• http://www.chemistry.wustl.edu/~coursedev/Online%20tutorials/Plink/limreag/probsetlr.htm
• helpful link that explains the concept and gives examples: http://chemwiki.ucdavis.edu/Analytical_Chemistry/Chemical_Reactions/Limiting_Reagents

Percent Yield

Theoretical yield- the maximum amount of a given product that canbe formed when the limiting reagent is comopletely consumed

Percent yield- the actual yield of a product as the percentage of the theoretical yield

Practice: 

• http://tmlimitingreagents.weebly.com/percentage-yield-and-actual-yield-practice-problems.html