Stoichiometry Exam
Balancing Chemical Equations and Types of Reactions
1. _____ C2H4O2 + _____ O2 → _____ CO2 + _____ H2O
Atoms
Reactants Side
Number of Atoms
Atoms
Products Side
Number of Atoms
Atoms
Products Side
Number of Atoms
Atoms
Products Side
Number of Atoms
Reactants: _________________________________
Products: __________________________________
Reaction Type: _____________________________
2. _____ Ca + _____ CuF2 → _____ CaF2 + _____ Cu
Atoms
Reactants Side
Number of Atoms
Reactants: _________________________________
Products: __________________________________
Reaction Type: _____________________________
3.
_____ K + _____ F2 → _____ KF
Atoms
Reactants Side
Number of Atoms
Reactants: _________________________________
Products: __________________________________
Reaction Type: _____________________________
4. ____ AgBr  ____ Ag + ____ Br2
Atoms
Reactants Side
Number of Atoms
Atoms
Products Side
Number of Atoms
Reactants: _________________________________
Products: __________________________________
Reaction Type: _____________________________
5. _____ Li2SO4 + _____ K3PO4 → _____ Li3PO4 + _____ K2SO4
Atoms
Reactants Side
Number of Atoms
Reactants: _________________________________
Products: __________________________________
Reaction Type: _____________________________
Stoichiometry Calculations
1 mole = 6.02 x 1023 particles (Avogadro’s #)
1 mole = Molar Mass (g/mol)
Mole Ratio: use balanced equation
Atoms
Products Side
Number of Atoms
Given the balanced chemical equation, perform the following calculations (6-10).
1 MgCl2 + 2 KOH → 1 Mg(OH)2 + 2 KCl
Number of Moles of Each Substance:
1. _________________________________
2. _________________________________
3. _________________________________
4. _________________________________
Molar Mass (g/mol) of Each Substance:
1. _________________________________
2. _________________________________
3. _________________________________
4. _________________________________
6. How many moles of KOH are needed to react with 1.8 moles of MgCl2?
Given:
Step(s):
1. ___________________
Calculation
Desired:
Mole Ratio:
7. How many moles of Mg(OH)2 are produced from 27.3 grams of MgCl2?
Given:
Desired:
Mole Ratio:
Step(s):
1. __________________
2. __________________
Calculation
8. How many grams of KOH are needed to produce 12.2 grams of Mg(OH)2?
Given:
Step(s):
1. __________________
2. __________________
3. __________________
Calculation
Desired:
Mole Ratio:
BONUS – 10 Points
9. How molecules of KCl are produced from 6.8 grams of KOH?
Given:
Step(s):
1. __________________
2. __________________
3. __________________
Calculation
Desired:
Mole Ratio: