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Episode 801 Episode 801

Episode 801 - PowerPoint Presentation

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Episode 801 - PPT Presentation

How many moles of water will be produced when 8 grams of hydrogen gas react with the oxygen in the air S toichiometry Study of the quantity mass relationships in a chemical reaction Based on ID: 498467

moles mol co2 n2h4 mol moles n2h4 co2 react episode c6h12o6 801 produced grams oxygen ali3 form magnesium gas problem h2o reaction

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Slide1

Episode 801

How many moles of water will be produced when 8 grams of hydrogen gas react with the oxygen in the air?Slide2

Stoichiometry

Study of the

quantity (mass)

relationships in a chemical reactionBased on balanced equations2Mg + O2  2MgOTwo atoms of magnesium reaction with 1 oxygen molecule to form 2 magnesium oxide formula unitsorTwo moles of magnesium atoms react with 1 mole of oxygen molecules to form 2 moles of magnesium oxide formula units

Episode 801Slide3

The

coefficients

in a

balance equation give the MOLE RATIO for the substances involved in the reaction.Example problem:When elemental aluminum reacts with elemental iodine, aluminum iodide is produced.2 Al + 3 I2  2 AlI3Mole ratios: ____

Al: ____I

2 ____Al: ____AlI3 ____I2: ____AlI3 If you start with 4 moles of Al, how many moles of AlI3 will be produced?

2

2

2

2

3

3

? mol AlI3 = 4 mol Al

2 mol Al

2 mol AlI3

= 2 mol AlI

3

Episode 801Slide4

Problem Set 1

N

2

H4 + N2O4  N2 + H2OBE SURE TO BALANCE THE EQUATION FIRST!!? mol N2H

4

= 2.72 mol N2H4? mol N2 = 2.72 mol N2H4

2

3

4

2.72 mol N2H

4

2 mol N2

H41 mol N

2O4

= 1.36 mol N

2

O

4

2.72 mol N

2

H

4

2 mol N

2

H

4

3 mol N

2

= 4.08 mol N

2

Episode 801Slide5

Episode 801

How many moles of water will be produced when 8 grams of hydrogen gas react with the oxygen in the air?

(Hint: To “make the switch” between different substances in a reaction, use the

mole ratio from the balanced equation.)2 H2 + O2  2 H2

O

? mol H2O = 8 g H2(Hint: We will need to change grams of H2 to moles H2)

2

g H

2

1 mol H2

2

mol H

2

2 mol H2O

= 4 mol H2

OSlide6

Problem Set 2

In photosynthesis, carbon dioxide and water react to form glucose, C

6

H12O6 and oxygen gas.If 15.6g of carbon dioxide react, how many moles of glucose will be produced?How many grams of carbon dioxide must react to form 0.25 moles of glucose?6 CO2

+ 6 H

2O  C6H12O6 + 6 O

2

? mol C6H12O

6 = 15.6g CO2

44g CO2

1 mol CO2

6

mol CO21 mol C6

H12O6

= 0.059 mol C6

H12O

6

?

g

CO

2

= 0.25 mol C

6

H

12

O

6

1

mol C

6

H

12

O

6

6

mol CO2

1 mol CO

2

44g CO

2

= 66g CO

2

Episode 801Slide7

Challenge Problem

When nitrogen and hydrogen react, they form ammonia gas, which has the formula NH

3

. If 56.0 g of nitrogen are used up in the reaction, how many grams of ammonia will be produced? Episode 801