Calculate the chemical amount of ammonia present in a 11.22g sample of the compound

3.97 x 10²³atoms

Explanation:

Given parameters:

Mass of ammonia = 11.22g

Unknown:

Chemical amount of ammonia present  = ?

Solution:

The chemical amount present in a substance is the number of atoms it contains.

To solve this problem, from the given mass find the number of moles first.

  Number of moles  =

Molar mass of NH₃   = 14 + 3(1) = 17g/mol

  Number of moles  =   = 0.66mole

   1 mole of any substance contains  6.02 x 10²³ atoms

  0.66 mole of ammonia will contain 0.66 x 6.02 x 10²³ atoms

                                                            = 3.97 x 10²³atoms

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