What do you do with leftover moles?

How do you get moles from leftovers?


  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 find the limiting reactant with moles?


  1. Calculate the number of moles of each reactant by multiplying the volume of each solution by its molarity.
  2. Determine which reactant is limiting by dividing the number of moles of each reactant by its stoichiometric coefficient in the balanced chemical equation.


How do you convert from moles to grams?

In order to convert the moles of a substance to grams, you will need to multiply the mole value of the substance by its molar mass.

How many molecules is a mole?

Avogadro’s Number and the Mole. The mole is represented by Avogadro’s number, which is 6.022×1023 atoms or molecules per mol.

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Is limiting reactant the smaller one?

Yes. It’s called the limiting reactant because it gets used up first in a chemical reaction. This results in the smallest amount of reactant in a chemical equation. Excess is the opposite, having the largest amount.

What is a good percent yield?

Usually a reaction is given a maximum percentage yield; as the name suggests, this is the highest percentage of theoretical product that can practically be obtained. A reaction yield of 90% of the theoretical possible would be considered excellent. 80% would be very good. Even a yield of 50% is considered adequate.

Why is excess reactant important?

A good way to ensure that one reactant fully reacts is to use an excess of the other reactant. The other reactant becomes a limiting factor and controls how much of each product is produced. … While using excess reactants can help to increase percentage yields, this is at the expense of atom economy.

How do I calculate moles?

  1. First you must calculate the number of moles in this solution, by rearranging the equation. No. Moles (mol) = Molarity (M) x Volume (L) = 0.5 x 2. = 1 mol.
  2. For NaCl, the molar mass is 58.44 g/mol. Now we can use the rearranged equation. Mass (g) = No. Moles (mol) x Molar Mass (g/mol) = 1 x 58.44. = 58.44 g.

When 12 moles of o2 reacts with 1.1 mole of c10h8 What is the limiting reactant?

Explanation: it is so bcz 1 mole of C10H8O must requires 12 moles of o2 so 6 moles must require 6*12 which is 72 moles. so o2 is limiting reagant.

What is the mole ratio?

A mole ratio is a conversion factor that relates the amounts in moles of any two substances in a chemical reaction. The numbers in a conversion factor come from the coefficients of the balanced chemical equation.

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How do you know if it’s a limiting reactant problem?

Determining the Limiting Reagent

One way to determine the limiting reagent is to compare the mole ratio of the amount of reactants used. … If the amount of B present is less than is required, then B is the limiting reagent. To begin, the chemical equation must first be balanced.

How do you find the limiting reactant quickly?

Re: How to find the limiting reactant easily and quickly

The easiest way is to convert both reactant quantities into moles of the particular product that we are solving for. This will allow you to easily observe which one of the reactants produces the least amount of product and is, therefore, the limiting reactant.

Is limiting reagent and limiting reactant the same?

In much the same way, a reactant in a chemical reaction can limit the amounts of products formed by the reaction. When this happens, we refer to the reactant as the limiting reactant (or limiting reagent).

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