How many moles of Oxygen atoms do you have when you have 1.20 x {10}^{25} N2O5 molecules?

100 moles of Oxygen

Explanation:

We are given;

1.20 x 10^25 molecules of N₂O₅

We are required to determine the number of moles of Oxygen in 1.20 x 10^25 molecules of N₂O₅.

We know that;

1 mole of N₂O₅ contains 6.022 x 10^23 molecules of N₂O₅ Therefore, we can determine the number of moles of N₂O₅ containing 1.20 x 10^25 molecules of N₂O₅.

Moles = Number of molecules : Avogadro's number

= 1.20 x 10^25 molecules : 6.022 x 10^23 molecules/mole

= 19.9 moles

= 20 moles

But, 1 mole of N₂O₅ contains 5 moles of Oxygen

Therefore;

20 moles of N₂O₅ will have;

= 20 moles * 5

= 100 moles

Therefore, 1.20 x 10^25 molecules of N₂O₅ contains 100 moles of oxygen.