Mole Ratios in Chemical Reactions
A Grade 12 Chemistry worksheet focusing on understanding and applying mole ratios in various chemical reactions.
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Mole Ratios in Chemical Reactions
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Read each question carefully and provide the best answer. Show all your work for calculations.
1. A mole ratio is a conversion factor derived from the of a balanced chemical equation.
2. In the reaction 2H₂ + O₂ → 2H₂O, the mole ratio of H₂ to O₂ is .
3. Mole ratios are essential for performing calculations in chemistry.
4. What is the mole ratio of oxygen to aluminum oxide in the following balanced chemical equation: 4Al + 3O₂ → 2Al₂O₃?
3:2
2:3
4:2
2:4
5. In the decomposition of water, 2H₂O → 2H₂ + O₂, how many moles of hydrogen gas are produced from 4 moles of water?
1 mole
2 moles
4 moles
8 moles
6. Balance the following chemical equation and then state all possible mole ratios:
N₂ + H₂ → NH₃
7. For the reaction 2SO₂ + O₂ → 2SO₃, if you have 0.5 moles of SO₂, how many moles of O₂ are required for a complete reaction?
8. Mole ratios can only be determined from unbalanced chemical equations.
True
False
9. The coefficients in a balanced chemical equation represent the mole ratios of reactants and products.
True
False
10. Consider the combustion of propane: C₃H₈ + 5O₂ → 3CO₂ + 4H₂O. If you start with 2.5 moles of C₃H₈, calculate the moles of CO₂ and H₂O produced, and the moles of O₂ consumed.
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