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
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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