Formula to determine the number of moles is:
[tex]number of moles = \frac{mass of an element/compound}{Molar mass of element/compound}[/tex] -(1)
Need to determine the number of moles of oxygen atoms in 35.2 g of oxygen.
Molar mass of oxygen, [tex]O_2[/tex] = [tex]15.99\times 2 = 31.98 g/mol[/tex]
Mass of oxygen = 35.2 g (given)
Substituting the values in formula (1):
[tex]number of moles = \frac{35.2 g}{31.98 g/mol}[/tex]
[tex]number of moles = 1.101 mole[/tex]
Since, oxygen molecule contains 2 atoms of oxygen. So,
[tex]number of moles of oxygen = 1.101\times 2 mole = 2.202 mole[/tex]
Hence, number of moles of oxygen atom in 35.2 g of oxygen is 2.202 moles.
