Stoichiometry III Tutorial

Tutorial for Experiment: Stoichiometry III

EXAMPLE: What are the maximum numbers of C and E molecules that can be prepared from 20 molecules of A , 6 molecules of B, and 4 molecules of D?

EXPERIMENT: Add 20 molecules of A, 6 molecules of B, and 4 molecules of D to the container and allow the animation to proceed until molecules of C and E are no longer formed.

PROCEDURE:

  1. Enter 20 for the number of A molecules (red balls).



  2. Enter 6 for the number of B molecules (blue balls).



  3. Enter 4 for the number of D molecules (cyan balls).



  4. Click the Start button to initiate the animation.



  5. Allow the reactions to proceed to completion (product molecules C and E are no longer formed).



  6. Click the Stop button and record the number of the A, B, C, D, and E molecules.





RESULTS and OBSERVATIONS: The maximum numbers of C and E molecules that can be produced are 6 molecules of C and 4 molecules of E. During the animation a C molecule is formed when one A molecule collides with one B molecule and a E molecule is formed when one A molecule collides with one D molecule. Since there are only 6 B molecules, then the maximum number of pairs of A and B molecules that can combine to form C molecules is 6 and thus the maximum number of C molecules that can form is 6. Likewise, the 4 D molecules limit the maximum number of E molecules that can be formed to 4. Note that at least 10 A molecules are needed to produce the 6 C molecules and 4 E molecules.