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| The green reactant is the excess quantity, whereas the red one is the limiting reagent. |
- Reactions do not take place exactly as how they are described in balanced chemical equations.
-Reason: conditions necessary for the reaction to take place may not be present (ie. pressure, temperature, concentration, etc.)
- It is necessary to add more of one reactant than the amount we get from stoichiometry calculations.
-Reason: it is impossible for every atom/molecule of the reactants to come together.
- Limiting Reactant/Reagent: the ONE reactant that is used up in a chemical reaction.
- Excess Quantity: the reactants that are left over.
- How much of the excess quantity is left?
Steps: 1. balance equation
2. convert grams of reactant #1 to grams/moles of product #1
3. convert grams of reactant #2 to grams/moles of product #2
4. compare the answer u get from 2 and 3, the lower one is the amount that will be produced.
5. calculate the grams of the excess reactant needed in this reaction.
6. calculate the difference between grams of the actual grams of the excess reactant provided and # you get form step 5.
