Solutions to Web Experiment:Stoichiometry III

Web Experiment: Stoichiometry III
Answers to Questions


  1. One molecule of A collides with one molecule of B and a molecule of C is formed. Collisions between six pairs of A and B molecules produces six C molecules.


  2. One molecule of A collides with one molecule of D and a molecule of E is formed. Collisions between six pairs of A and D molecules produces six E molecules.


  3. Collisions between B and D molecules do NOT result in the formation of new molecules. B does not react with D.


  4. Each of the six B molecules collides with an A molecule to produce a C molecule. Each of the six D molecules collides with an A molecule to produce a E molecule. Six C molecules and six E molecules are formed. The two reactions, A + B to form C and A + D to form E, occur simultaneously and independently of each other.





  6. Each of the six B molecules collides with an A molecule to produce a C molecule. Each of the four D molecules collides with an A molecule to produce a E molecule. Six C molecules and four E molecules are formed. A total of ten A molecules are consumed. Two A molecules remain. Since all of the B molecules and all of the D molecules were consumed, B and D are the limiting reactants.


  7. Twelve molecules of A are needed to react with the six molecules of B and the six molecules of D. Since there are only ten molecules of A, two molecules of B or two molecules of D or one B molecule and one D molecule will remain after all of the A molecules are consumed. A is the limiting reactant.


  8. Since there were no C molecules initially and six molecules of C were found in the container after the reaction, then the change in the number of C molecules was six.


    The change in the number of molecules of B is related to the change in the number of molecules of C by a mole ratio.


    The initial number of B molecules is then equal to the difference between the final number of B molecules and the change in the number of B molecules.


    In a similar manner you can demonstrate that the initial number of D molecules is ten. Confirm your calculations by allowing six molecules of B and ten molecules of D to react with twenty-five molecules of A.