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Chap 12 . Stoichiometry . Do Now Balance C 2 H 5 OH + O 2 → CO 2 + H 2 O Objective – Introduction to Stoichiometry HW – Pg. 358 # 9, 10 . Mole Ratios . 2H 2 + O 2 → 2H 2 O. Atoms . 2H 2 + O 2 → 2H 2 O. Atoms

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chap 12

Chap 12

Stoichiometry

slide2

Do Now

Balance C2H5OH + O2→ CO2 + H2O

  • Objective – Introduction to Stoichiometry
  • HW – Pg. 358 # 9, 10
2h 2 o 2 2h 2 o1
2H2 + O2 → 2H2O

Atoms

4 atoms H added to 2 atoms O yield 4 atoms H and 2 atoms

2h 2 o 2 2h 2 o2
2H2 + O2 → 2H2O

Atoms

4 atoms H added to 2 atoms O yield 4 atoms H and 2 atoms

Molecules

2 molecules H added to 1 molecule O yield 2 molecules H2O

2h 2 o 2 2h 2 o3
2H2 + O2 → 2H2O

Moles

2 mol Hydrogen added to 1 mol Oxygen yield 2 mol Water

2h 2 o 2 2h 2 o4
2H2 + O2 → 2H2O

Moles

2 mol H added to 1 mol O yield 2 mol H20

Mass

12 3 limiting reagent and percent yield
12.3 Limiting Reagent and Percent Yield

Do Now

Can you start a fire with water?

Objective

Limiting Reagent and Percent Yield

Homework

Pg. 370 # 25,26

liming reagent
Liming Reagent

Limiting Reagent – The reagent you run out of

Excess Reagent – The reagent you do not run out of

how to determine limiting reagent
How to Determine Limiting Reagent

Cu + S → Cu2S

What is missing?

how to determine limiting reagent1
How to Determine Limiting Reagent

2Cu + S → Cu2S all equations must be balanced in stoichiometry

What is the main unit of measurement used in stoichiometry?

2cu s cu 2 s
2Cu + S → Cu2S

What is the limiting reagent when 80.0 g Cu reacts with 25.0g S?

  • Convert to Moles
  • Pick a reactant and use all of it. Do you have enough of the other?
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