Question

How to find Theoretical Yield?!

Answer 1

There's two types of yield, theoretical yield and actual yield.
Theoretical yield is the yield that is what you calculated or expected from a chemical reaction.
Actual yield is the yield that you observed or obtained after the reaction took place.

Normally, actual yield should be less than theoretical yield because all the reactants burnt away does not always turns into the product you wanted, instead, they will turn into heat, other chemicals or other forms of energy.

Answer 2

the theoretical yield can be found for the stoichiometric chemical equation

Answer 3

using a balanced equation -- you take the reactants and set each up in a stoichiometry equation to find out which reactant limits your product--EXAMPLE:

2 Al + Fe2O3 ----> 2 Fe

say you have 113.32 grams of Al & 279.48 grams of Fe2O3 and you need to know which is the limiting reagent in grams?


use the
use molar mass balanced equation use molar mass

113.32 g Al 1 mol Al 2 mol Fe 55.85 g Fe
--------- ----------- -----------
26.98 g Al 2 mol Al 1 mol Fe


=234.6 g Fe


Now the other reactant.......


use the
use molar mass balanced equation use molar mass

279.48 g Fe2O3 1 mol Fe2O3 2 mol Fe 55.85 g Fe
------- ---- ----
159.70 g Fe2O3 1 mol Fe2O3 1 mol Fe


=195.5 g Fe



*** the SMALLEST UNIT of that reactant (compound or element in beginning of the equation) WINS -- that is your Theoretical Yield (*also known as limiting reactant) =

Fe2O3 <---circle this reactant as your answer he is the one you don't have enough of to make any more product -- Theoretically you are limited by how much he can yield!