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How Do You Solve Stoichiometry Problem On The 4 Easy Steps

October 26th, 2008

As a high school student you may sometimes facing stoichiometry on your chemistry course. There are many students having difficulties on solving of stoichiometry problems. Do you know that it’s very easy to solve this problem if you recognize the technique. These simple methods will allow you to better understanding on the way how you solve the stoichiometry questions.

1. Just balance the equation of the reaction

Question about stoichiometry mostly involving chemical reaction, thus the important first thing you should do is balancing the equation. Check for the reaction coefficients of all reactants and products, do they have balance number on each atoms? If the number of the atoms in the reactants and products all the same you did the right thing.

2. Convert units of given substance to moles

You should find in the problem what is the given substance that can convert into moles, this substance always have at least 2 variables such as mass with Mr (relative molecular mass), Molarity with volume, or the number of atoms or molecules, or anything variables. The moles of this given substance become the main role on counting the other substance.

3. Find moles of wanted substance using mole ratio in the balance equation

Take the moles of given substance under the same substance in the balanced equation and by using the reaction coefficients compare the coefficient of the wanted substance with given substance that we have found the moles and multiply with the moles of the given substance you will get the moles of wanted substance.

4. Convert the moles of wanted substance into the desired units

After you found the moles of wanted substance you can convert to desired units that the problem wants. If you need to solve it in the mass unit you just multiply the moles with the Mr (relative molecular mass), if you need to changes it into concentration unit you just divide the moles by its volume, and if you need to convert it into the number of atoms or molecules you just multiply by Avogadro’s number.

That is, its very easy isn’t it?

Entry Filed under: Tips and Trick