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Sadly, for this example, we have to move on from our beloved methane combustion equation ( Pretty intimidating if you don’t know what to do, right? In this case, we can see that the p H passes through the equivalence point (where the acid and the base cancel each other out and the p H is of oxalic acid. You’ll notice that the common thread running through all of them is the expected value.Essentially, if you understand expected value really well, you should be able to figure out most of the rest.
He was appointed chemist at the royal porcelain factory in Berlin.
Along with the law of definite proportions (stoichiometry) he also developed titrations.
The AACT high school classroom resource library has everything you need to put together a unit plan for your classroom: lessons, activities, labs, projects, videos, simulations, and animations.
We constructed a unit plan using AACT resources that is designed to teach the concepts of stoichiometry and limiting reactants to your students.
In other words, stoichiometry is the practice of using a chemical reaction equation to predict the results of the reaction. Of course, that means that we need to start with a chemical reaction.
When we look at the two sides of the reaction, we have to make sure that the number of atoms of each element on each side is the same because of the principle of conservation of mass. In this section of the AP Chemistry Crash Course, we’ll start by looking at the basic concepts of stoichiometry, and then we’ll cover five applications for stoichiometry on the AP Chemistry exam.
The standard practice to eliminate this problem is to simply carry out both calculations as expected value calculations.
So, let’s pretend that we’re calculating the expected value of , so oxygen is the limiting reactant here because its expected value in the reaction was less.
So, because oxygen has twice the molar mass and we need twice as much of it, we need four times as much oxygen in grams as we need methane. It’s more, so we can tell that oxygen is the limiting reactant in this reaction, as we discovered through the more involved calculation.
If this isn’t immediately intuitive, don’t waste too much time thinking about it; it’s almost always more useful to just carry out the two expected value calculations.