What mass of znco3 contains 3.11×1022 o atoms

The molecular formula of the compound is , from the molecular formula it is clear that 1 mol of contains 3 mol of oxygen.

Also, in 1 mol there are atoms thus, 3 mol of oxygen will have atoms of oxygen.

Thus, there are atoms of oxygen present in 1 mol of .

1 atom of oxygen will be there in mol.

Number of oxygen atoms given is thus, this will be present in of .

Molar mass of is 125.388 g/mol, thus, mass can be calculated as follows:

Rearranging the above equation,

Putting the values,

Therefore, the mass of  is 2.16 g.

the answer is a and have a great day