Thermal Stoichiometry - Questions

The Thermal Stoichiometry Concept Builder is comprised of 16 multi-part, numerical  questions spread across three difficulty levels. Students will receive one question for each difficulty level. Questions involve either the completion of a sentence (Apprentice Level) or the completion of a table (Master and Wizard Levels). The Concept Builder is coded to select at random a question for each level.

The three Difficulty Levels in this Concept Builder differ only in terms of the complexity of the thermodchemical equations and the complexity of the given numbers. Here is the breakdown of the levels:
 

• Apprentice Difficulty Level: Questions 1-4 ... Students complete five sentences by providing a numerical value for a blank by using the ratios in a thermochemical equation.
• Master Difficulty Level: Questions 5-10 ... Students complete a five row table relating reactant mass, reactant moles, and kJ of heat released. The reaction involves propane combustion. There are 13 calculations. Most numbers are nice.
• Wizard Difficulty Level: Questions 11-16 ... Students complete a five row table relating reactant mass, reactant moles, and kJ of heat released. The reaction involves butane combustion. There are 13 calculations. Most numbers are nasty.

The questions from each group are shown below. Teachers are encouraged to view the questions in order to judge which difficulty levels are most appropriate for their classes. Alternatively, teachers can do the Concept Builder to gain a feel for the student experience.. 

The Physics Classroom grants teachers and other users the right to print these questions for private use. Users are also granted the right to copy the text and modify it for their own use. However, this document should not be uploaded to other servers for distribution to and/or display by others. The Physics Classroom website should remain the only website or server from which the document is distributed or displayed. We also provide a PDF that teachers can use under the same conditions. We have included a link to the PDF near the bottom of this page.

 

 

Thermal Stoichiometry

 
 
Apprentice Difficulty Level
Question 1
Consider the thermochemical equation for methane combustion:
CH₄  +  2 O₂  ==> CO₂  +  2 H₂O  +  890 kJ 
The reaction of ...
a.      ... 1.0 mole of CH₄will release ____________ kJ of energy.
b.      ... 4.0 mole of CH₄will release ____________ kJ of energy.
c.      ... _________ mole of CH₄will release 445 kJ of energy.
d.      ... 32 grams of CH₄will release ____________ kJ of energy.
e.      ... 27 mole of CH₄will release ____________ kJ of energy.
 
 
Question 2
Consider the thermochemical equation for methane combustion:
CH₄  +  2 O₂  ==> CO₂  +  2 H₂O  +  890 kJ 
The reaction of ...
a.      ... 1.0 mole of CH₄will release ____________ kJ of energy.
b.      ... 3.0 mole of CH₄will release ____________ kJ of energy.
c.      ... _________ mole of CH₄will release 1780 kJ of energy.
d.      ... 8.0 grams of CH₄will release ____________ kJ of energy.
e.      ... 21 mole of CH₄will release ____________ kJ of energy.
 
 
Question 3
Consider the thermochemical equation for methane combustion:
CH₄  +  2 O₂  ==> CO₂  +  2 H₂O  +  890 kJ 
The reaction of ...
a.      ... 2.0 mole of CH₄will release ____________ kJ of energy.
b.      ... 3.0 mole of CH₄will release ____________ kJ of energy.
c.      ... _________ mole of CH₄will release 890 kJ of energy.
d.      ... 48 grams of CH₄will release ____________ kJ of energy.
e.      ... 19 mole of CH₄will release ____________ kJ of energy.
 
 
Question 4
Consider the thermochemical equation for methane combustion:
CH₄  +  2 O₂  ==> CO₂  +  2 H₂O  +  890 kJ 
The reaction of ...
a.      ... 1.0 mole of CH₄will release ____________ kJ of energy.
b.      ... 2.5 mole of CH₄will release ____________ kJ of energy.
c.      ... _________ mole of CH₄will release 445 kJ of energy.
d.      ... 16 grams of CH₄will release ____________ kJ of energy.
e.      ... 35 mole of CH₄will release ____________ kJ of energy.
 
 

 
Master Difficulty Level
Question 5
Consider the thermochemical equation for propane combustion:
 
C₃H₈+  5 O₂    ==> 3 CO₂+  4 H₂O  +  2200 kJ
 
Fill in the table showing the mass-mole-energy relationships for this reaction.
 


 
Question 6
Consider the thermochemical equation for propane combustion:
 
C₃H₈+  5 O₂    ==> 3 CO₂+  4 H₂O  +  2200 kJ
 
Fill in the table showing the mass-mole-energy relationships for this reaction.
 


 
 
Question 7
Consider the thermochemical equation for propane combustion:
 
C₃H₈+  5 O₂    ==> 3 CO₂+  4 H₂O  +  2200 kJ
 
Fill in the table showing the mass-mole-energy relationships for this reaction.
 

 
 
Question 8
Consider the thermochemical equation for propane combustion:
 
C₃H₈+  5 O₂    ==> 3 CO₂+  4 H₂O  +  2200 kJ
 
Fill in the table showing the mass-mole-energy relationships for this reaction.
 

 
 
Question 9
Consider the thermochemical equation for propane combustion:
 
C₃H₈+  5 O₂    ==> 3 CO₂+  4 H₂O  +  2200 kJ
 
Fill in the table showing the mass-mole-energy relationships for this reaction.
 

 
 
Question 10
Consider the thermochemical equation for propane combustion:
 
C₃H₈+  5 O₂    ==> 3 CO₂+  4 H₂O  +  2200 kJ
 
Fill in the table showing the mass-mole-energy relationships for this reaction.
 

 

 
Wizard Difficulty Level
Question 11
Consider the thermochemical equation for propane combustion:
 
2 C₄H₁₀+  13 O₂    ==> 8 CO₂+  10 H₂O  +  5750 kJ
 
Fill in the table showing the mass-mole-energy relationships for this reaction.
 

 
 
Question 12
Consider the thermochemical equation for propane combustion:
 
2 C₄H₁₀+  13 O₂    ==> 8 CO₂+  10 H₂O  +  5750 kJ
 
Fill in the table showing the mass-mole-energy relationships for this reaction.
 

 
 
 
Question 13
Consider the thermochemical equation for propane combustion:
 
2 C₄H₁₀+  13 O₂    ==> 8 CO₂+  10 H₂O  +  5750 kJ
 
Fill in the table showing the mass-mole-energy relationships for this reaction.
 

 
 
 
Question 14
Consider the thermochemical equation for propane combustion:
 
2 C₄H₁₀+  13 O₂    ==> 8 CO₂+  10 H₂O  +  5750 kJ
 
Fill in the table showing the mass-mole-energy relationships for this reaction.
 

 
 
 
Question 15
Consider the thermochemical equation for propane combustion:
 
2 C₄H₁₀+  13 O₂    ==> 8 CO₂+  10 H₂O  +  5750 kJ
 
Fill in the table showing the mass-mole-energy relationships for this reaction.
 

 
 
 
Question 16
Consider the thermochemical equation for propane combustion:
 
2 C₄H₁₀+  13 O₂    ==> 8 CO₂+  10 H₂O  +  5750 kJ
 
Fill in the table showing the mass-mole-energy relationships for this reaction.