Question

1mole of water has 16 g of oxygen atom i.e. 1 atom of oxygen. Is an atom really that much large to weigh 16 g?

Answer 1

1 mole oxygen has 16 g weight.

1 mole oxygen is not 1 atom

1mole oxygen contain 6.022*10^23 atoms

So mass of an atom

=16/(6.022*10^-23) g