Chap 12
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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

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Chap 12

Chap 12

Stoichiometry


Chap 12

  • Do Now

    Balance C2H5OH + O2→ CO2 + H2O

  • Objective – Introduction to Stoichiometry

  • HW – Pg. 358 # 9, 10


Mole ratios

Mole Ratios


2h 2 o 2 2h 2 o

2H2 + O2 → 2H2O

Atoms


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


2h 2 o 2 2h 2 o5

2H2 + O2 → 2H2O

Volume


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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