Question

How many moles of o are in 15.0 mol fe(no3)3?

Answer 1

n[Fe(NO₃)₃]=15.0 mol

n(O)=3×3×n[Fe(NO₃)₃]=9n[Fe(NO₃)₃]

n(O)=9×15.0=135.0 mol

Answer 2

Answer : The number of moles of oxygen atoms are 135 moles.

Explanation : Given,

Moles of
`Fe(NO_3)_3` = 15.0 mole

The given chemical formula is,
`Fe(NO_3)_3`

By the mole concept:

In
`Fe(NO_3)_3`, there are 1 mole of iron (Fe) atom, 3 moles of nitrogen (N) atoms and 9 moles of oxygen (O) atoms.

As, 1 mole of
`Fe(NO_3)_3` contains 9 moles of oxygen atoms

So, 15.0 moles of
`Fe(NO_3)_3` contains
`15.0* 9=135` moles of oxygen atoms.

Hence, the number of moles of oxygen atoms are 135 moles.