1. Convert milligrams to grams:
* 1 milligram (mg) = 0.001 grams (g)
2. Calculate the number of moles of oxygen:
* The molar mass of oxygen (O2) is 32 g/mol.
* Moles = mass / molar mass
* Moles = 0.001 g / 32 g/mol = 3.125 x 10^-5 mol
3. Calculate the number of molecules:
* One mole of any substance contains Avogadro's number of particles (6.022 x 10^23).
* Number of molecules = moles x Avogadro's number
* Number of molecules = 3.125 x 10^-5 mol x 6.022 x 10^23 molecules/mol = 1.88 x 10^19 molecules
4. Calculate the number of atoms:
* Each oxygen molecule (O2) contains 2 oxygen atoms.
* Number of atoms = number of molecules x 2
* Number of atoms = 1.88 x 10^19 molecules x 2 atoms/molecule = 3.76 x 10^19 atoms
Therefore, there are approximately 3.76 x 10^19 oxygen atoms present in 1 milligram of oxygen.
