1. Stoichiometry

2. Problem  What mass of water is produced when 15.8 g of NH 3 reacts with 21.8 g of O 2 to produce NO gas and water?

3. What is the first step? Balance the Equation Divide NH 3 by O 2 to find the difference between the two Add the reactants to find the total grams produced

4. Correct!!!  Good Work  Awesome  Fantastic

5. Sorry…WRONG  This is NOT a step in STOICHIOMETRY—Remember to balance the equation before doing any other step

6. Sorry…WRONG  This step is incorrect and is not a part of STOICHIOMETRY—balance the equation FIRST

7. How do you balance this Equation?  NH 3 + O 2  NO + H 2 O

8. Balancing The Equation…  2NH 3 + O 2  2NO + 3H 2 O

9. Is this how you set up the problem? Is this how you set up the problem? TrueFalse

10. Correct!!!

11. WRONG! How else would you set it up? Shown is the correct way

12. Finally, Solving the Equation!!! = (15.8x1x3x18.02)/(17.04x2x1) =(21.8x1x3x18.02)/(32x1x1) =25.06 g H 2 O =32.83 G H 2 O