The above formula is the formula for converting the number of moles into the number of molecules.
Variables:
- N: Number of molecules
- n: Number of moles
- NA :The Avogadro constant
Explanation:
This should be quite straight-forward. We know that the Avogadro constant is 6.22×1023, meaning that there are 6.22×1023 molecules for every mole present, and therefore we multiply the Avogadro constant by the number of mols to obtain the number of molecules. This is the same as dozens. If one dozen equals to twelve, then three dozens equal to 3*12, which is 36.
You can also use this equation to convert the number of molecules to the number of moles. You just change the equation a bit:
Other Important Information
One thing that you need to keep in mind is that the variable n is the number of molecules, which is different from the number of atoms. For example, say you have 10 molecules of H2O, you will actually have 20 atoms of hydrogen because for every molecule of H2O, you'll have two hydrogen atoms (look at the subscript!)
Examples:
A) How many atoms of magnesium are in 0.76 mol of a magnesium sample?
B) If there are 3.11×1024 molecules of gold in a sample of a metal, how many mols of gold are present in the sample?
A) How many atoms of magnesium are in 0.76 mol of a magnesium sample?
B) If there are 3.11×1024 molecules of gold in a sample of a metal, how many mols of gold are present in the sample?
C) How many atoms of potassium are in 0.880 mol of K2O?
.
.
.
Answers:
A) Substitute n=0.76 and NA =6.22×1023 into the formula N= n × NA, and solve for N. You should get N= 4.73×1023
.
.
.
Answers:
A) Substitute n=0.76 and NA =6.22×1023 into the formula N= n × NA, and solve for N. You should get N= 4.73×1023
B) Substitute NA =6.22×1023 and N =3.11×1024 into the formula n= N ÷ NA, and solve for n. You should get n=5
C) To find the number of molecules of K2O, substitute n=0.880 and NA =6.22×1023 into the formula N= n × NA, and solve for N. You should get N=5.4736×1024. Then, since there are two potassium atoms for each molecule of K2O, multiply N by 2, and you should get 10.9 as you answer.
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