# Stoichiometry.  ¾ cup sugar  3 cups flour  ½ cup butter  3 Tbls baking soda  Yield: 38 cookies  How many dozen cookies can you make if you only.

## Presentation on theme: "Stoichiometry.  ¾ cup sugar  3 cups flour  ½ cup butter  3 Tbls baking soda  Yield: 38 cookies  How many dozen cookies can you make if you only."— Presentation transcript:

Stoichiometry

 ¾ cup sugar  3 cups flour  ½ cup butter  3 Tbls baking soda  Yield: 38 cookies  How many dozen cookies can you make if you only have 2 Tbls of baking soda?

 How many grams of NH 3 can be produced from 27 grams of H 2 ?

 gA → mol A  mol A → mol B  mol B → g B  Variations: L → mol molecule → mol

 Compares the actual results of an experiment to the theoretical (calculated) results % yield = Why may yield not be 100% of the expected value?

 Limits or determines the amount of product that can be formed because the reactant is fully used during the reaction  Calculate the theoretical product using each given reactant value and the lower yield will indicate the limiting reactant

 The reactant that is not completely used up in the chemical reaction  Calculate the amount of excess reactant needed using moles of the limiting reactant.

 N 2 + 3H 2 → 2NH 3 90 g 22.4 g

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