Question

What equation is used to calculate percent yield?
Note: $E$= experimental; $T$=theoretical
A. $\dfrac{E}{T} \times 100$
B. $\dfrac{{(E - T)}}{T} \times 100$
C. $\dfrac{T}{E} \times 100$
D. $\dfrac{{(T - E)}}{T} \times 100$

Answer 1

Percent yield is the percent ratio of experimental yield to the theoretical yield. It is calculated as experimental yield divided by theoretical yield multiplied by 100%. If the experimental and theoretical yield are having the same value, the percent yield is 100%.

Complete step by step solution:
Firstly we have theoretical yield, which is the amount of the product calculated from the limiting reactant. So the limiting reactant is the reactant in the chemical reaction which limits or lowers the amount of product that can be formed. And the actual yield is the actual amount produced when the experiment or reaction is carried out or while doing.
The discrepancy between the theoretical yield and the actual yield can be calculated using the percent yield, which uses this formula:
$\dfrac{E}{T} \times 100$
Where Actual yield is the amount of product obtained from a chemical reaction.
Theoretical yield is the amount of product obtained from the stoichiometric or balanced equation, using the limiting reactant to determine product from a chemical reaction.
To use the formula for percent yield, we need to make sure that our actual yield and theoretical yield are in the same units or not. For example : if the actual yield is in grams, then the theoretical yield also needs to be in grams. If theoretical yield is in moles, then the actual yield also needs to be in moles. You will need to perform the conversions if you are given one measurement unit and you need the other.

So, the correct option is A.

Additional Information:
Yield which is also referred to as reaction yield, it is the measurement of the quantity of moles present in the chemical reaction. It is usually represented in percentage. Yield is definitely considered by scientists as it is the one of the primary factors in organic and inorganic chemical processes.
The percent of the yield tells the quality of the yield. Sometimes percent yield is low due to incomplete reactions like some reactants don't produce as products as a result.

Note: Typically, percent yield is lower than 100% in light of the fact that the real yield is frequently not exactly the hypothetical worth. Purposes behind this can incorporate inadequate or contending responses and loss of test during recuperation. It's workable for percent respect be over 100%, which implies more examples were recouped from a response than anticipated. This can happen when different responses were happening that likewise framed the item.