How do you find the leftover reactant?

How do you find the leftover reactant?

Strategy

1. Write the chemical equation.
2. Calculate the moles of product from the first reactant.
3. Calculate the moles of product from the second reactant.
4. Identify the limiting reactant and the excess reactant.
5. Calculate the mass of excess reactant used up.
6. Calculate the mass of unused excess reactant.

How do you know if there is a limiting reactant?

One way to determine the limiting reagent is to compare the mole ratios of the amounts of reactants used. This method is most useful when there are only two reactants. The limiting reagent can also be derived by comparing the amount of products that can be formed from each reactant.

Is the reactant that gets used up first?

The limiting reactant (or limiting reagent) is the reactant that gets consumed first in a chemical reaction and therefore limits how much product can be formed. The amount of product that can be formed based on the limiting reactant is called the theoretical yield.

What is an excess reactant?

An excess reactant is a reactant present in an amount in excess of that required to combine with all of the limiting reactant. It follows that an excess reactant is one remaining in the reaction mixture once all the limiting reactant is consumed.

What is the excess reactant example?

The excess reactant may be found using the balanced chemical equation for a reaction, which gives the mole ratio between reactants. If you start a reaction with 1 mole of each substance, then silver iodide is the limiting reactant and sodium sulfide is the excess reactant.

How to find the limiting reagent in a chemical equation?

The following points should be considered while attempting to identify the limiting reagent: When there are only two reactants, write the balanced chemical equation and check the amount of reactant B required to react with reactant A. When the amount of reactant B is greater, the reactant A is the limiting reagent.

When does an excess reactant become a limiting reactant?

Introduction to Limiting Reactant and Excess Reactant. The limiting reactant or limiting reagent is the first reactant to get used up in a chemical reaction. Once the limiting reactant gets used up, the reaction has to stop and cannot continue and there is extra of the other reactants left over.

How to calculate excess reactant in stoichiometry?

1 Figure out which of the reactants is the limiting reactant or limiting reagent. 2 See how much product can be formed by using the maximum amount of the limiting reactant or limiting reagent. 3 The excess reactant is what is left over after all of the limiting reactant has been used up.

How to find the limiting agent in stoichiometry?

The reactant which is in a lesser amount than is required by stoichiometry is the limiting reactant. In an alternate method of finding the limiting agent, the amount of product formed by each reactant is calculated.