Answer :
Part 1: 4.93 moles of
contains 9.86 moles of oxygen atoms.
Part 2: 2.01 moles of
contains 2.01 moles of oxygen atoms.
Explanation :
<u>Part 1:</u> 4.93 mol 
In 1 mole of
, there are 2 atoms of hydrogen and 2 atoms of oxygen.
As, 1 mole of
contains 2 moles of oxygen atoms.
So, 4.93 moles of
contains
moles of oxygen atoms.
Thus, 4.93 moles of
contains 9.86 moles of oxygen atoms.
<u>Part 2: </u>2.01 mol 
In 1 mole of
, there are 2 atoms of nitrogen and 1 atom of oxygen.
As, 1 mole of
contains 1 mole of oxygen atoms.
So, 2.01 moles of
contains
moles of oxygen atoms.
Thus, 2.01 moles of
contains 2.01 moles of oxygen atoms.