Answer:

One mole of anything contains 6.02 x 10^23 molecules. So there are how many moles P2O5 in 1.2 x 10^25 molecules? There are

1.2 x 10^25 molecules x (1 mol/6.02 x 10^23 molecules) = y moles P2O5.

Then moles oxygen atoms is;

mols oxygen atoms = y moles P2O5 x (5 oxygen atoms/1 mol P2O5) = ??

O in SO3 is done the same way.

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