Transcript Mole to Mole Stoichiometry

Mole to Mole Stoichiometry
Stoichiometry – Chapter 9 – Section 2
Mole Ratios
• We did this Friday!
• CaCl2 + 2Na → 2NaCl + Ca
• 1 mol CaCl2
or
2 mol Na
• 1 mol CaCl2
or
2 mol NaCl
• 1 mol CaCl2
or
1 mol Ca
• 2 mol Na
2 mol NaCl
• 2 mol Na
1 mol Ca
• 2 mol NaCl
1 mol Ca
or
or
or
2 mol Na
1 mol CaCl2
2 mol NaCl
1 mol CaCl2
1 mol Ca
1 mol CaCl2
2 mol NaCl
2 mol Na
1 mol Ca
1 mol Na
1 mol Ca
2 mol NaCl
Mole to Mole Stoichiometry
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Uses Mole ratios.
According to the following equation:
CO2 + 2LiOH → Li2CO3 + H2O
How many moles of lithium hydroxide are
required to react with 20 mol of CO2?
• ? mol LiOH = 20 mol CO2 (2 mol LiOH) =
(1 mol CO2)
• 40 mol LiOH
Mole to Mole Stoichiometry Hints
• You must start with a balanced equation.
• Write the compound or element name in the
ratios.
• Include “moles” in the ratios, also.
Your turn!
• Tetrachloroethylene, C2Cl4, is a dry-cleaning
fluid made from acetylene, C2H2, and Cl2,
according to this equation:
C2H2 + 3Cl2 + Ca(OH)2 → C2Cl4 + CaCl2 + H2O
How many moles of Cl2 are needed to react
with 4 mol of C2H2?
• 12 mol Cl2
Another type of problem
• The elements lithium and oxygen react
explosively to form lithium oxide. How many
moles of lithium oxide will form if 5 mol of
lithium react.
• Li + O2 → Li2O
• 4Li + O2 → 2Li2O
• ? mol Li2O = 5 mol Li (2 mol Li2O) =
(4 mol Li )
• 2.5 mol Li2O
Your Turn!
• The disinfectant hydrogen peroxide, H2O2,
decomposes to form water and oxygen. How
many moles of oxygen will result from the
decomposition of 5 mol of hydrogen
peroxide?
• 2.5 mol O2
Homework
• Worksheet (don’t do #5) + Pg 305 5+6
• Please do Pg 305 on the back of the
worksheet.
• You must show your work to receive full
credit.