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- 1. Multiple Choice
What is a mole ratio?
An animal that burrows underground.
How many moles of reactant are used up in a chemical reaction.
The ratio of a reactant / product to a different one - compared by the number of particles.
The process by which we multiply fractions by using numbers from a chemistry problem.
- 2. Multiple Choice
Where are the numbers for a mole ratio found?
They are part of the chemical formulas for the reactants / products.
They are given in the problem.
They are found on the periodic table for those elements.
They are found as coefficients in the reaction's balanced chemical equation.
- 3. Multiple Choice
2 C2H6 + 7 O2 → 4 CO2 + 6 H2O
Ethane (C2H6) combusts in the above reaction. What is the mole ratio of ethane to oxygen gas?
- 4. Multiple Choice
2 C2H6 + 7 O2 → 4 CO2 + 6 H2O
Ethane (C2H6) combusts in the above reaction. What is the mole ratio of carbon dioxide to water?
- 5. Multiple Choice
2 C2H6 + 7 O2 → 4 CO2 + 6 H2O
A problem asks how many moles of oxygen gas are needed to react completely with 6 moles of ethane (C2H6). What is the first step in setting up the problem?
- 6. Multiple Choice
2 C2H6 + 7 O2 → 4 CO2 + 6 H2O
A problem asks how many moles of oxygen gas are needed to react completely with 6 moles of ethane (C2H6). What is the second step in setting up the problem?
- 7. Multiple Choice
2 C2H6 + 7 O2 → 4 CO2 + 6 H2O
A problem asks how many moles of oxygen gas are needed to react completely with 6 moles of ethane (C2H6). What is the final answer for this problem?
13 mol C2H6
3 mol O2
21 mol O2
42 mol O2
- 8. Multiple Choice
2 C2H6 + 7 O2 → 4 CO2 + 6 H2O
New problem: If 16 moles of carbon dioxide are formed by this reaction, how many moles of water were also produced?
4 mol H2O
6 mol H2O
24 mol H2O
96 mol H2O
384 mol H2O
- 9. Multiple Choice
2 C2H6 + 7 O2 → 4 CO2 + 6 H2O
New problem: If 3.5 moles of oxygen gas are used up as ethane combusts completely, how many moles of carbon dioxide are produced?
0.5 mol CO2
0.57 mol CO2
2.0 mol CO2
3.0 mol CO2
3.5 mol CO2
- 10. Multiple Choice
2 C2H6 + 7 O2 → 4 CO2 + 6 H2O
New problem: How many moles of ethane (C2H6) are required to produce 13.5 moles of water from the above reaction?
4.5 mol C2H6
27 mol C2H6
40.5 mol C2H6
81 mol C2H6
162 mol C2H6
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