The reactant that determines the amount of product that can be formed in a reaction?
When the limiting reactant is completely used up. A limiting reactant is the reactant that determines the amount of product. To determine this use the balanced chemical reaction with the masses of the reactants to determine the moles of product formed. The reactant that forms the least amount of product will be the limiting reactant.
limiting reactant/reagent is the reactant/reagent that is in lesser amount in terms of the number of moles. this is the reactant/reagent that determines the theoretical yield of a product(s) in a chemical reaction excess reactant/reagent is the reactant/reagent that is in greater amount in terms of the number of moles.
The limiting reactant is that reactant in a chemical reaction that will be used up first. Put another way, it is the reactant that is in the smallest supply. The way it controls the amount of product formed is that once it is used up, no more product can be formed, so the amount of product formed ultimately depends on the amount of the limiting reactant.
Limiting reactants are the reactants that are used up first. And once they are used up, they stop, or limit, the reaction. So the amount of product that can be produced depends on the limiting reactant. The other reactant, the one in excess, would predict a larger amount of product. But once we produce the amount of product predicted by the limiting reactant. The limiting reactant is used up and the reaction stops.
Why does the amount of product formed is directly proportional to the amount of limiting reactant used?
What part of chemical equation allows us to determine how much product you can get from a known amount of reactant?
Whichever is the limiting reactant. Let's say you have a chemical equation that is: 3A + 1B --> 1C And you have 3 moles of A and 1000 moles of B. You can only make 3 moles of the product, C because A is the limiting reactant with only three moles. You will have 997 moles of B leftover. The limiting reactant controls the amount of product formed.
If a reaction is reversible what are the relative amounts of reactant and product at the end of the reaction?
The word "excess" is used in chemistry primarily to compare the amount of one reactant available for reaction with the amount of a different such reactant. The reactant that is present in more than sufficient amount to react completely with all the other reactants, to produce the expected product(s), is present in "excess".