Stoichiometry
Stoichiometry is the calculation of reactants and products in chemical reactions. Master mole ratios, limiting reagents, percent yield, and mass-to-mass conversions for quantitative chemistry.
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Study Tips
- ✓Always start with a balanced chemical equation
- ✓Use dimensional analysis to track units through conversions
- ✓Identify the limiting reagent before calculating theoretical yield
- ✓Practice converting between grams, moles, and particles systematically
Common Mistakes to Avoid
Students often forget to balance the equation first, use the wrong molar mass, or identify the limiting reagent incorrectly. Always compare mole ratios to determine which reactant runs out first. Remember that percent yield = (actual yield / theoretical yield) x 100%.
Stoichiometry FAQs
Common questions about stoichiometry
The limiting reagent is the reactant that is completely consumed first in a chemical reaction, determining the maximum amount of product that can be formed. The other reactants are called excess reagents.
Percent yield = (actual yield / theoretical yield) x 100%. The theoretical yield is calculated from stoichiometry assuming the limiting reagent is completely converted to product. The actual yield is measured experimentally.
Mole ratios from balanced equations tell us the exact proportions in which reactants combine and products form. They allow us to convert between amounts of different substances in a reaction.
Related Topics
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