Experiment: Stoichiometry II


    The JAVA applet below simulates the gaseous reaction of borane with ethylene in a closed container. In this simulation the molecules of BH3 and H 2CCH2, labeled A and B, are symbolically represented by red and blue balls. A green ball represents a molecule of the product C (H2BC(H2)CH3).


    Enter the number of molecules of A (BH3) and the number of molecules of B (H 2CCH2) and click the "Start" button to begin the simulation. The number of A or B molecules should not exceed 40. Click the "Stop" button to end the simulation. When the simulation stops, the number of molecules and mass of compounds A, B, and C (H2BC(H2)CH3) at the instant of cessation are displayed above the reaction container.

    Use the applet in the design and performance of experiments to answer the following questions.

  1. What is required for product C to form?
  2. How many molecules of A and moleucles of B are needed to prepare 10 moleucles of C?
  3. How many grams of A and grams of B are needed to prepare 10 molecules of C?
  4. If 5 additional A molecules are added to the number of A molecules and B molecules in the previous question, will the number of C molecule produced increase?
  5. What is the molar mass (MW) of compound C?
  6. If 2.2973 • 10-22 g of A and 6.9878 • 10-22 g of B are placed in the container, how many molecules will by present at the end of the reaction?
  7. Write a balanced chemical equation for the reaction.

    Include data from your experiments to support your answers to the questions. For example to answer the first question enter 4 for the number of A molecules and 4 for the number of B molecules, click the "Start" button, and observe what happens. Stop the animation, enter 0 for the number of A molecules and 4 for the number of B molecules, start the simulation, and observe what happens. Again, stop the animation, enter 4 for the number of A molecules and 0 for the number of B molecules and repeat the process. What do the results of these experiments suggest about the requirements for this reaction? See the Tutorial for Experiment: Stoichiometry II for an additional example and help.

    If you have preformed all of the experiments, answered all of the questions, and completed the report to be submitted for credit, then you may check the Answers to Stoichiometry II Questions



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