Solutions to Web Experiment: ICF Table

Web Experiment: Initial-Change-Final Table
Answers to Questions


  1. Two molecules of C, i.e. A     +     B           2 C


  2. Ten molecules of C are formed.



  3. As we can see from the animation, all of the B molecules are consumed and the final number of B molecules in the container is zero. Hence, B is the limiting reactant. Since the initial number of B molecules plus the change in the number of B molecules equal the final number of B molecules, the change in the number of B molecules must be -6.



    The magnitude of the change in the number of C molecules is equal to the magnitude of the change in the number of B molecules times the mole ratio.
    Since the molecules of C are formed, the change in the number of C molecules is a positive number. The sum of the initial number of C molecules and the change in number of C molecules gives 12 for the final number of C molecules. Indeed, we observed the formation of one dozen C molecules.



  4. A is the limiting reactant and thus the change in the number of A molecules is -5. The magnitude of the change in the number of B molecules is related to the magnitude of the change in the number of A molecules by a mole ratio.
    Since molecules of B are consumed, then the change in the number of molecules of B is a negative number, -5.