Stoichiometry Essay

Improved Essays
Background
Stoichiometry is a branch of chemistry that measures the quantity of chemicals in a reaction. This branch relies heavily on moles and balancing. A mole is a unit of measure for giant quantities. It is a number of atoms or molecules that is so large that it is only logical and convenient to use it for atoms and molecules. One mole is 6.02 x 1023 atoms or molecules. We call this Avogadro's Number. Furthermore, balancing chemical equations is the process of changing determining the coefficients in a chemical equation, making sure that nothing is created or destroyed. Stoichiometry allows scientists to determine the mass of any chemical in a chemical equation as long as the mass of one species of that equation is given. Scientists convert
…show more content…
The clay triangle does not heat up, keeping the ring stand from getting hot.
Turn on gas, and close the windows of the bunsen burner.

It will not light with the windows open.
Use a striker to light the bunsen burner.

This is our only way to light the bunsen burner.
Open the windows and let the baking soda cook for thirty three minutes.

The decomposition of baking soda will not occur immediately.
Let the crucible and its contents cool down.

When hot, it is reacting, but after it cools down, the reaction is complete.
Weigh the crucible and its contents, subtracting the former’s weight, leaving the mass of the latter (3.07 grams)

This mass if the most crucial piece of data of the lab as it ultimately reveals what reaction took place.
11. Let sit for weekend, then take its mass again (2.4 g)
To observe any changes.

Data
Equation of Reaction 1 1NaHCO3(s)→ 1NaOH(s) + 1CO2(g)
Equation of Reaction 2
2NaHCO3(s)→1Na2CO3(s)+ 1CO2(g)+ 1H2O(g)
Equation of Reaction 3 2NaHCO3(s)→ 1Na2O(s) + 2CO2 (g)+ 1H2O(g)
Equation of Reaction 4
1NaHCO3(s)→ 1NaH(s)+ 1CO(g)+ 1O2(g)
Mass of
…show more content…
That is almost exactly the mass predicted using stoichiometry for the solid in reaction two, which is 3.15 grams. The theoretical yields of the other reactions are very illogical because the percent differences are extensive. The solid yield is denser than sodium carbonate, indicating that it lost material - gas. However, visually, the amount of material in the crucible appears to be the same. There is no significant change to the amount of substance - it did not look like we lost half of its mass, or anything along those

Related Documents

  • Improved Essays

    This lab makes use of the reaction excess powdered calcium carbonate and different concentrations limiting hydrochloric acid in order to determine the effect of changing concentration on the rate of the reaction. Students will carry out 3 trials of 5 experiments each trial. The five different experiments are for the various concentrations of hydrochloric acid (0.2, 0.4, 0.6, 0.8, 1.0 mol/L). First measure out approximately 2 grams of powdered calcium carbonate using a weighing boat and analytical balance. Then, measure out 30 mL of 0.2 M hydrochloric acid into a volumetric flask.…

    • 198 Words
    • 1 Pages
    Improved Essays
  • Improved Essays

    Introduction The goal of this experiment was to determine atomic weight of Kandimonium and the relative number of M&M’s in Kandimonium. Kandimonim is composed of three isotopes: Skittles, M&M’s, and Sweet Tarts, and the ratio of Sweet Tarts to Skittles is 27:18. The relative number of M&M’s and the atomic mass were determined by weighing each of the different Isotopes and calculating their average masses for further calculations.…

    • 649 Words
    • 3 Pages
    Improved Essays
  • Decent Essays

    In this Beanium lab, the objective was to make sense of the numbers used to calculate average atomic mass. By separating, counting, and weighing beans we were able to create the numbers used to calculate the weight of one bean. From there, we could use the total number of beans to produce the percent abundance for each type of bean. These were the numbers that we had to produce in order to understand how and why there are many types of isotopes for each element. In doing this lab, we can think through the importance of finding the average atomic mass and not just using a single isotope for an element.…

    • 409 Words
    • 2 Pages
    Decent Essays
  • Improved Essays

    Alka Seltzer Lab

    • 250 Words
    • 1 Pages

    The purpose of this lab was to understand the Law of Conservation of Mass and how it works, using half of an Alka-Seltzer tablet, concealed in a water to fill the container, while a balloon sealed the top to keep it a closed system. The hypothesis was, if the Alka-Seltzer chemical reaction is a closed system, then the mass of the products will equal the reactants. The data did not support the hypothesis because the products were almost always a different mass to the reactants but only the last trial revealed that the mass of the reactants was equal to the products. Usually, the trials indicated a loss of mass until the third trial was done, which was a success. Since the experiment was a closed system, matter could not leave or enter.…

    • 250 Words
    • 1 Pages
    Improved Essays
  • Improved Essays

    Unknown Compounds

    • 816 Words
    • 4 Pages

    For the reaction that formed the precipitate, using stoichiometry, the masses were equal between the unknown beginning, the hypothesized beginning, the unknown ending, and the hypothesized ending, once again confirming our…

    • 816 Words
    • 4 Pages
    Improved Essays
  • Improved Essays

    Approximately ¾ inch of the Copper(II)Carbonate was placed into a test tube. The test tube, by means of a clamp, was fastened to a ring standard to be heated by the Bunsen Burner. A one hole rubber stopper fitted with a glass tube was fitted into the top of the test tube. A measurement of 5 ml of the Limewater was placed into a graduated cylinder. With test tube holders, a separate test tube was held over the end of the glass tubing to collect the gas produced.…

    • 1370 Words
    • 6 Pages
    Improved Essays
  • Improved Essays

    “The Law of Conservation of Mass states that matter can be changed from one form into another, mixtures can be separated or made, and pure substances can be decomposed, but the total amount of mass remains constant.” (University Of Wisconsin) The data the was found from our lab shows that the data is not consistent to the Law of Conservation of Mass because our results showed an increase in mass. To start the lab, .7 grams of copper was measured out and at the end, the total amount of copper was .73 grams.…

    • 1243 Words
    • 5 Pages
    Improved Essays
  • Improved Essays

    Density Lab Report Essay

    • 979 Words
    • 4 Pages

    Introduction Density measures the volume that a given amount of mass takes up. Usually, density has grams per unit volume as a unit. To find the density of an object, the object has to be measured and its mass has to be divided by its volume. Often times, density is used to identify substances, since different elements have specific densities. This experiment is made up of two sections; the first section measures the density of water and the density of an unknown substance.…

    • 979 Words
    • 4 Pages
    Improved Essays
  • Improved Essays

    Observed/theoretical X 100 1.476 g/3.08 g X 100=47.9% Discussion of Results: There was too much error introduced into the experiment to be able to indicate exactly which product was obtained through the experiment. I believe the results were supposed to include the product being erythro-2,3-dibromo-3-phenypropanoic acid and the mechanism that took place in the experiment was in fact the bromonium ion mechanism. My group’s percent error was 47.9% which is extremely low. This low percent error was gained from the lack of mass of the product obtained after vacuum filtration.…

    • 717 Words
    • 3 Pages
    Improved Essays
  • Decent Essays

    In a chemical equation, there are the reactants, which is the part that is changed, and the products, which is what is left over. The reactant side and the product side must have the same quantity of each element. If they do not, the equation must be balanced by using coefficients. Mole ratios can be found by using these coefficients. Mole ratios are conversion factors and can be used to found the amounts of the reactants and the products in a chemical reaction.…

    • 289 Words
    • 2 Pages
    Decent Essays
  • Improved Essays

    Chemistry is a branch of science that deals with the identification of the substances of which matter is composed. It also involves the properties and the ways in which they interact, combine, and change. Chemistry is important to life. The environment is composed of many chemicals without identification of chemicals we wouldn’t know what chemicals are safe to have around or which chemicals are harmful and dangerous to our bodies. To answer the enduring question, how do we gain knowledge to understand a chemical system, particularly since we cannot see atoms or molecules?…

    • 727 Words
    • 3 Pages
    Improved Essays
  • Great Essays

    The volume of sodium thiosulphate will be 50cm³. The different concentrations of hydrochloric acid are 0.10M, 0.25M, 0.50M, 0.60M, 0.90M and 1.0M. Now, I will discuss my prediction of what will happen during the experiment. Prediction: My prediction is, • As I increase the concentration of hydrochloric acid and add it to the sodium thiosulphate the rate of reaction will decrease. This happens because more particles are being added to the solution when the concentration increases.…

    • 2652 Words
    • 11 Pages
    Great Essays
  • Improved Essays

    Chemistry is something that people use in everyday life. All the food we eat has to do with chemistry. Food has organic compounds that change when they are cooked. It is used in our everyday life when because you need chemistry to do everything. Stoichiometry is the relationship between the relative quantities of substances taking part in a reaction or forming a compound.…

    • 548 Words
    • 3 Pages
    Improved Essays
  • Great Essays

    We then massed the crucible and added two grams of the unknown carbonate to the crucible, then recorded its combined mass. We then repeatedly heated, cooled, and massed the crucible until the mass of the crucible and the unknown carbonate no…

    • 890 Words
    • 4 Pages
    Great Essays
  • Improved Essays

    When the experiment was conducted, the magnesium was heated with a bunsen burner for about 6 minutes only. However, the complete reaction could have required more time for all of the magnesium to react and produce magnesium oxide. As calculated in Figure 1, the expected percent composition of magnesium in magnesium oxide is 60.32% and according to the law of definite proportion3, this percentage should be constant. Given this information, the amount of magnesium oxide that can be produced using 0.06g of magnesium can be determined. As shown in Figure 7, 0.1g of magnesium oxide could have been produced by 0.06g of magnesium.…

    • 917 Words
    • 4 Pages
    Improved Essays