Using english to predict rendement of product a reaction

In chemistry, the chemical yield, the yield of the reaction, or only the rendement refers to the amount of reaction product produced in the chemical reaction. [1] Absolute rendement can be written as weight in grams or in moles (molar yield). The relative yield used as a calculation of the effectiveness of the procedure is calculated by dividing the amount of product obtained in moles by the theoretical yield in moles:

Fractional yield = actual rendement divided by theoretical rendement 

To obtain a percentage yield, multiply the fractional yield by 100%.
One or more reactants in chemical reactions are often used redundantly. The theoretical rendement is calculated based on the number of moles of the limiting reagent. For this calculation, it is usually assumed that there is only one reaction involved.
The ideal chemical yield value (theoretical rendement) is 100%, a value highly unlikely to be achieved in its practice. Calculate the percentage of rendement that is by using the following equations percent rendemen = weight yield / weight of yield divided by the sample weight multiplied by 100%

In stoichiometry there is a special note on
Theoretical results, tangible results, and percent of results

• Theoretical results are the amounts calculated from the balanced chemical equations or how many products   are derived based on stoichiometric calculations.
• The real or actual result is the number of results actually generated in a chemical reaction or how many products are obtained after the reaction is complete.
• Efficiency of chemical reaction can be determined through percentage of result or percentage of rendemen that is: Percent of result: (result of real / theoretical result) x 100%

Here is an example of rendemen
1. If the reaction between 6 grams of ethane C2H6 (Mr = 30) with 7.1 grams of Cl2 (Mr = 71) yields 5.16 grams of C2H6Cl (Mr = 64.5) then the percentage of ethylchloride rendement is ...

Answer:
In this case we are required to calculate% C2H6Cl, so let's compare facts and theories:

FACT:
The resulting C2H6Cl period = 5.16 grams

 

THEORY:

We look for the C2H6Cl period that results from the reaction

 

The reaction is happening

Theoretically C2H5Cl resulting from the reaction is 0.2 mol

2. Synthesis of aspirin
Ways of working
• A total of 2.8 g of salicylic acid was incorporated into a 125 mL erlenmeyer. Then 8 mL of acetic anhydride was added while rinsing. Added also 85% H3PO4 catalyst as a hydration agent of 0.5 mL, after which it is heated.
• Next, After 5 minutes lifted and 4 mL of aquades added. Waited for 6 minutes, then added 40 mL aquades. Let up to crystallize (if not crystallized, wall-casting with stirring rods)
• Added 100 mL cold aquades. Wait until crystals form

Calculation of rendemen
• Once obtained the crystal then weighed and calculated rendemen
• In the experiment used salicylic acid as much as 2.8 g, so salicylic acid mole can be calculated, that is 2.8 / 138 = 0.02 mol.
• The resulting aspirin can be calculated theoretically ie the mole of aspirin multiplied by its Mr.
Mol aspirin = mol salicylic acid = 0.02 mol.
Gram of aspirin is theoretically 0.02 x 180 = 3.6 grams.
• From the experiments generated aspirin as much as 2.4 grams, then the crystal is taken and calculated rendemennya.
Then rendemennya:
(Mass of experimental results / theoretical mass) x 100% =
(2.4 grams / 3.6 grams) x 100% = 66.67%.