Stoichiometry. 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?

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Presentation transcript:

Stoichiometry

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?

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

Correct!!!  Good Work  Awesome  Fantastic

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

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

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

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

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

Correct!!!

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

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