What is the total number of atoms in 3.0 molecules of propanone, CH3COCH3? (Avogadro’s constant = 6 x 1023 mol-1)

1.81 x 10²⁴atoms

Explanation:

Given parameters:

Number of molecules  = 3 moles

Unknown:

Number of atoms = ?

Solution:

To solve this problem, we are going to use the mole concept.

   1 mole of any substance contains 6.02 x 10²³ atoms

 So

   3 mole of propanone will contain 3 x  6.02 x 10²³ atoms  = 1.81 x 10²⁴atoms