When limestone (which is principally CaCO3)is heated, carbon dioxide and quicklime (CaO) are produced by the reaction:CaCO3(s)→CaO(s) + CO2(g) .If 16.5 g of CO2 was produced from the thermal decomposition of 43.23 g of CaCO3, what is the percentage yield of the reaction?Answer in units of %.The reaction of 5.3 grams of chlorine withexcess fluorine produced 11.6 grams of ClF3.What percent yield of ClF3 was obtained?Answer in units of %.
Well it's great that you were given a balanced equation to begin with. That always helps. From there, you want to calculate the theoretical yield of CO2 produced. You do this by seeing what the maximum amount of CO2 produced from your given amount of reactant is. You must use a mole-to-mole ratio to find this equivalence. In fact, whenever you compare amounts of any two chemicals (whether they be product to product, reactant to reactant, product to reactant) you will ALWAYS use a mole to mole ratio. Don't forget this on your midterm! Here's how to do the work:
Once you know the theoretical yield (this is what you would get if you got a 100% yield, which almost never happens in real lab situations), you compare it to your actual yield by the following equation:
For the next problem, you need to write a balanced equation. It is very important to remember that in nature, Chlorine and Fluorine are both diatomic molecules. there are seven elements that behave this way: Hydrogen, Oxygen, Fluorine, Bromine, Iodine, Nitrogen, and Chlorine. Remember the word "HOFBrINCl" It sounds like "Hof-brinckle". It's silly, but it works. So here is your balanced equation:
Then do as we did above and find theoretical yield.
Andddd now compare to your actual yield, which was given.