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10^22 molecules are removed from 0.9g of h2o.the number of moles left is
That will be moles = grams/molar mass.
Convert moles of H2O to molecules.  There are 6.022 x 10^23 molecules in a mole.

Since there is 1 atom of oxygen per molecules, that will be the number of atoms of oxygen. The atoms of hydrogen will be twice that.
a) 18 g of water = 1 g-mol = 6.022x10^23 molecules of water
so, 0.9 g of H2O contain 3.011x10^22 molecules of water.

b) Since 1 molecule of water contain 1 atom of oxygen

So, 0.9 g of water contain 3.011x10^22 atoms of oxygen.


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