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Calculate the number of atoms in 0.551 gram of potassium (K
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23

8.51 x 10²¹ atoms

Explanation:

Given parameters:

Mass of K = 0.551g

Unknown:

Number of atoms = ?

Solution:

To find the number of atoms in this given substance, we need to solve for the number of moles first.

 Number of moles  =

 Now;

     Molar mass of K  = 39g/mol

 Number of moles  = = 0.014mole

Therefore,

   1 mole of a substance contains 6.02 x 10²³ atoms

  0.014 mole of K will contain 0.014 x 6.02 x 10²³ = 8.51 x 10²¹ atoms

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