Find the total number of atoms in a sample of cocaine hydrochloride, c17h22clno4, of mass 21.0 mg .

The number of atoms in given amount of cocaine hydrochloride is

Explanation:

To calculate the number of moles, we use the equation:

Given mass of cocaine hydrochloride = 21.0 mg = 0.021 g    (Conversion factor:  1 g = 1000 mg)

Molar mass of cocaine hydrochloride = 339.8 g/mol

Putting values in above equation, we get:

In 1 mole of cocaine hydrochloride, 17 moles of carbon atom, 22 moles of hydrogen atom, 1 mole of chlorine atom, 1 mole of nitrogen atom and 4 moles of oxygen atoms are present

Total number of atoms in 1 mole of cocaine hydrochloride = (17 + 22 + 1 + 1 + 4) = 45 atoms

According to mole concept:

1 mole of a substance contains  number of atoms.

So, of cocaine hydrochloride will contain = number of atoms

Hence, the number of atoms in given amount of cocaine hydrochloride is