Solving Stoichiometry Problems

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Let's begin by calculating the concentration of a solution of glucose in water.

Say we take 2.00 g of glucose and add water until the final volume is 100 m L.

Next, we need to convert the denominator from milliliters to liters, which we do through the unit definition that there are 1000 milliliters per liter of solution.

Carrying out this math, we get a value of 0.111, and canceling units, we see that the final units are moles of glucose per liter of solution. Note that since the experimental conditions were known to three significant figures (both the 2.00 grams and the 100 milliliters are given to three significant figures), we keep three significant figures in the final result.

The study sought to find out difficulties encountered by high school chemistry students when solving stoichiometric problems and how these could be overcome by using a problem-solving approach. 485 participants drawn from 8 highs schools in a local education district in Zimbabwe participated in the study.

A validated stoichiometry achievement test was used to collect data at pre-test and post-test stages.It was strongly recommended that chemistry educators should analyse and understand student difficulties if they are to assist the learners to become confident and efficient problem solvers.Furthermore chemistry educators should implement the problem-solving pedagogical technique as a means of addressing the difficulties students have in stoichiometry problem-solving.Step #2 Using the equation, compare the moles of water made from moles of ethane.Step #3 Convert the moles of ethane back into grams of ethane.Therefore this type of question requires a three step solution.Step #1 Convert 1.61 grams of water to moles of water. Stoichiometry allows us to work in solution by giving us the concept of solution concentration, or molarity.Molarity is a unit that is often abbreviated as capital M.This balanced equation tells us a lot about how this reaction works. This one is another very important application of stoichiometry for the AP Chemistry exam.The core concept we can take away from it is that one molecule of methane combines with two molecules of diatomic oxygen to form one molecule of carbon dioxide and two molecules of water, or correspondingly, that one mole of methane combines with two moles of diatomic oxygen to form one mole of carbon dioxide and two moles of water. A note about nomenclature: saying reagent makes me feel like a mysterious alchemist, but I’m going to favor reactant because I think it’s a little bit clearer.


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