Chemlab 12 a mole ratio answers12/27/2022 ![]() ![]() ![]() The process outlined above is the process you would use to answer stoichiometric questions on a test. If I asked you how many slices of bologna and bread you need to create 10 sandwiches, you would immediately say 10 slices of bolgna and 20 slices of bread, right? Again the relationship given in the equation tells you how much is needed.ġ0 sandwiches x 1 slice bologna/1 sandwich = 10 slices bolognaġ0 sandwiches x 2 slices bread/1 sandwich = 20 slices breadįinally if I asked you how many sandwiches you could make with 5 slices of bologna and 8 slices of bread? Which of the two sandwich makings would run out first and how much of the excess makings would be left over? Well, the answers are 4 sandwiches could be made and 1 slice of bologna is left over.ĥ slices of bologna x 1 sandwich/1 slice bologna = 5 sandwichesĨ slices bread x 1 sandwich/2 slices bread = 4 sandwichesĨ slices bread x 1 slice bologna/2 slices bread = 4 slices of bologna usedĥ slices bologna - 4 slices used = 1 slice left over If I asked you how many sandwiches you could make with 12 slices of bread, you would immediately say 6, right? How did you know this? Well, obviously based on the equation, you make 1 sandwich for every 2 slices of bread you have.ġ2 slices bread x 1 sandwich/2 slices bread = 6 sandwiches Let's use an example that you all can understand first:ġ slice bologna + 2 slices of bread → 1 Sandwich While the use of the stoichiometry (fancy words for mole relationships in a reaction equation) may seem difficult, it really isn't. In a previous lecture I introduced the following analogy:Ī chemical reaction equation is essentially a table of conversion factors that we can use to predict amounts of products that can be made, reactants needed to make a specific amount of product or exact amounts of reactants needed to completely consume another reactant (eg. This equation is all 1:1 relationships, 1 mole of NaCl is made for every 1 mole of HCl or NaOH etc. When we read a balanced equation we relate every compound in the reaction to the others by means of the mole coefficients in the reaction. Reaction stoichiometry is a fancy way of describing mole relations in a reaction. In this lecture we cover the use of balanced chemical equations to make mole and mass predictions in reaction. The content that follows is the substance of lecture 14. ![]()
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