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Introduction to Stoichiometry
What is Mole Ratio?How can I determine mole ratio from
balanced equation?
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Can you cook? Can you follow a recipe?
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How do ingredients form products?
Reactants Products
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What is used to make “products” cookies?
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What is Stoichiometry?• Wikipedia Answer: branch of chemistry that
deals with the relative quantities of reactants and products in chemical reactions
• My Answer: recipe for reactions
Stoichiometry ~ Cooking
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How do you make a ham sandwich?
Gather Ingredients
(Chemical Reactants)
Combine Ingredients
(Rearrange Reactants)
Make Sandwich
(Form Products)
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Check Kitchen Khemistry HW
• What is the ratio of bread to ham? 2:1
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What is Mole Ratio?• Balanced equations reveal molar ratios!• Molar Quantities are derived from Coefficients• Moles = Coefficients
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Balance this equation!
_____ N2 (g) + _____H2 (g) ______ NH3 (g)1 3 2
ATOMS
MOLECULES
MOLES
2 6 8
1 3 2
1 3 2
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USE the Balanced Equation!
_____ N2 (g) + _____H2 (g) ______ NH3 (g)
What is the molar ratio of Nitrogen to Hydrogen?
1 3 2
Nitrogen : Hydrogen
1 : 3
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Importance of Molar Ratios• Molar ratios help to connect amounts of reactants.• How many sandwiches could I make with 4 slices of
bread and 2 slices of ham?
2 SandwichesRatio of Bread: Ratio of Ham
2: 1
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Apply to the Balanced Equation
How many moles of Ammonia could I make from 3 moles of Nitrogen?
_____ N2 (g) + _____H2 (g) ______ NH3 (g)1 3 2
GIVEN
3 mol N2
mol N2
mol NH3
1
26 mol NH3