WebQuest
MOLE RATIOS IN CHEMICAL EQUATIONS
Chemistry
PURPOSE:
In this activity, “learners use the coefficients in a balanced equation to develop the mole ratios of reactants and
products involved in the reaction. Five interactive examples illustrate the method, and students test their knowledge by
working four problems” (McClinton, McClinton, Douglass, 2004).
DIRECTIONS:
 Answer each question on your own paper as you progress through the activity.
 Navigate to: http://www.wisc-online.com
 In the search area (upper right corner), enter “Mole Ratios in Chemical Equations”
 Start the learning object by clicking “View”
QUESTIONS:
1. What is the title of this learning object?
2. What do balanced chemical equations show?
3. Copy the balanced chemical equation that represents the reaction of hydrogen gas with oxygen gas to produce
liquid water.
4. According to the chemical equation, the reactant(s) is/are:
5. According to the chemical equation, the product(s) is/are:
6. According to the chemical equation, the reacting hydrogen is in the (solid, liquid, gas) phase.
7. According to the chemical equation, the produced water is in the (solid, liquid, gas) phase.
8. What are the flashing numbers in front of each chemical formula called?
9. What do the flashing numbers indicate?
10. How many moles of H2O(l) are produced for every one mole of O2 (g) consumed?
11. How many moles of H2O(l) are produced for every two moles of H2(g) consumed?
12. How many moles of O2(g) are consumed when two moles of H2O(l) are produced?
13. How many moles of H2(g) are consumed for every one mole of O2(g) consumed?
14. What does a mole ratio do?
15. Copy the balanced chemical equation that represents the reaction of solid iron and water vapor to produce solid
Fe3O4 and hydrogen gas.
16. How many moles of H2(g) can be produced when three moles of Fe(s) react? Copy the calculation involving the
mole ratio for mol H2: mol Fe.
17. How many moles of H2(g) can be produced when one mole of Fe(s) reacts? Show your calculation! Hint: your
calculation must look nearly identical to the previous question.
18. How many moles of Fe(s) are required to react with two moles of H2O(g)? Show your calculation! Hint: your
calculation must look nearly identical to the previous question.
19. Copy the balanced chemical equation that represents the combustion of glucose, C6H12O6.
20. According to the equation, how many moles of CO2 are produced?
WebQuest
MOLE RATIOS IN CHEMICAL EQUATIONS
Chemistry
21. How many moles of CO2 are produced by the combustion of two moles of glucose? Show your calculation!
22. How many moles of glucose are consumed when three moles of CO2 are produced? Show your calculation!
23. Copy the balanced chemical equation that represents the combustion of propane, C3H8.
24. According to the equation, how many moles of water vapor are produced?
25. How many moles of H2O(g) are produced when 3.750 mol C3H8 react with O2? Show your calculation!
26. How many moles of O2(g) are required for complete combustion of 3.250 moles of propane? Show your
calculation!
BONUS:
1. What biologically critical reaction do questions 19-22 represent?
WebQuest
MOLE RATIOS IN CHEMICAL EQUATIONS
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Mole Ratios in Chemical Equations
Relative number of moles of reactants and products involved in the reaction
Equation: formation of water
hydrogen, oxygen
water
gas
liquid
coefficients
number of moles of substance
two
two
one
two
it relates the number of moles of any two substances involved in a chemical reaction
equation
4 mol H2
1.33 mol H2
1.5 mol Fe
equation: combustion of glucose
6 mol CO2
12 mol CO2
0.5 mol CO2
equation: combustion of propane
4 moles of water vapor
15 mol H2O
16.25 mol O2
BONUS: Cellular respiration
Chemistry