5.
The theoretical yield
What is the most possible amount of product obtained in a chemical reaction?
What is the maximum possible amount of product obtained in a chemical reaction?
the actual yield is equal to the theoretical yield
. Which reactant controls the amount of product formed in a chemical reaction? primary product.
What is the maximum amount of product possible in a reaction?
| A B | excess reactant The substance that is not used up completely in a reaction. | Theoretical yield Maximum amount of product that could be obtained under ideal conditions from a given amount of reactants. | Actual yield The measured amount of a product obtained from a reaction. |
|---|
What is the amount of product obtained in a chemical reaction?
In chemistry,
yield, also referred to as reaction yield
, is a measure of the quantity of moles of a product formed in relation to the reactant consumed, obtained in a chemical reaction, usually expressed as a percentage.
What controls the maximum amount of product?
A limiting reagent
is a chemical reactant that limits the amount of product that is formed. The limiting reagent gives the smallest yield of product calculated from the reagents (reactants) available. This smallest yield of product is called the theoretical yield.
What is the first thing you must do to solve a stoichiometric problem?
the first step in any stoichiometric problem is to always ensure that
the chemical reaction you are dealing with is balanced
, clarity of the concept of a ‘mole’ and the relationship between ‘amount (grams)’ and ‘moles’.
What is the most important chemical?
Sulfuric acid
is the world’s most important industrial chemical! In North America we produce about 50 million tons a year, mostly by burning sulfur to form sulfur dioxide which is then reacted with water. Why do we need all that sulfuric acid? Primarily to produce fertilizer.
Which substance is completely consumed in a chemical reaction?
In a chemical reaction,
the limiting reagent, or limiting reactant
, is the substance that has been completely consumed when the chemical reaction is complete.
How do you calculate the mass of product formed in a chemical reaction?
Determine the mass of the reaction product ZnS by
multiplying the number of moles of ZnS produced by the molar mass of ZnS
, as follows: 0.184 mole ZnS x 97.44 g ZnS/mole ZnS = 17.9 g ZnS. Note that the mass of the reaction product ZnS and the mass of reaction are the same.
How do reactants turn into products?
Breaking and Making Chemical Bonds
The reactants and products in a chemical reaction contain the same atoms, but they are rearranged during the reaction. As a result, the atoms end up in different combinations in the products. This makes the products new substances that are chemically different from the reactants.
Which are products and reactants?
A reactant is
a substance that is present at the start of a
chemical reaction. The substance(s) to the right of the arrow are called products . A product is a substance that is present at the end of a chemical reaction.
Can there be a limiting reagent if only one reactant is present?
When there is not enough of one reactant in a chemical reaction, the reaction
stops abruptly
. To figure out the amount of product produced, it must be determined reactant will limit the chemical reaction (the limiting reagent) and which reactant is in excess (the excess reagent).
How do you determine the limiting reactant?
- Write the balanced chemical equation.
- Convert from mass of reactants and product to moles using molar masses and then use mole ratios to determine which is the limiting reactant. …
- Calculate the percent yield by dividing the actual yield by the theoretical yield and multiplying by 100.
What do you call a reactant that is not used up completely?
In a chemical reaction, reactants that are not used up when the reaction is finished are called
excess reagents
. The reagent that is completely used up or reacted is called the limiting reagent, because its quantity limits the amount of products formed.
What is a real life example of stoichiometry?
Stoichiometry continues to be useful in many walks of life—a farmer determining how
much fertilizer to use
, figuring out how fast you have to go to get somewhere in a specific period of time, or just to make conversions between systems like Celsius and Fahrenheit.
