Stoichiometry

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Chapter 9

• Stoichiometry

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(No Transcript)
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Pancake Recipe

• 1 cup flour
• 2 eggs
• ½ cup water
• ¼ tsp baking powder
• Makes 5 pancakes
• We can write this recipe as an equation.

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1 cup flour 2 eggs ½ cup water ¼ tsp.
baking powder ? 5 pancakes

• If I have a 3 cups of flour how many pancakes can
  I make?

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1 cup flour 2 eggs ½ cup water ¼ tsp.
baking powder ? 5 pancakes

• How many cups of water will I need if I have 1
  dozen eggs?

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1 cup flour 2 eggs ½ cup water ¼ tsp.
baking powder ? 5 pancakes

• How many tsp. of baking powder will I need to
  make 13 pancakes?

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Chemical Equations are Recipes for Chemicals
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5C 2SO2 ? CS2 4CO

• How do we interpret this equation?
• 5 mol C 2 mol SO2 ? 1 mol CS2 4 mol CO
• IT TAKES MOLES TO MOVE

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5C 2SO2 ? CS2 4CO

• 7.42 mol C will produce how many mol CO?
• IT TAKES MOLES TO MOVE

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5C 2SO2 ? CS2 4CO

• 3 mol CS2 require how many mol C?
• IT TAKES MOLES TO MOVE

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C6H12O6 6O2 ? 6CO2 6H2O

• 3.60 mol C6H12O6 produce how many mol CO2?
• IT TAKES MOLES TO MOVE

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2KClO3 ? 2KCl 3O2

• 5.42 mol KClO3 will produce how many mol O2?
• IT TAKES MOLES TO MOVE