Question

How many molecules are contained in 1.30 mol O2

Answer 1

To convert from moles to molecules, simply multiply the number of moles by the Avogadros number which is about 6.022 x 10^23 molecules / moles.

Taking the O2 for example:

molecules of O2 = 1.30 moles * (6.022 x 10^23 molecules / moles)

molecules of O2 = 7.83 x 10^23 molecules

I believe you can do for the rest. Just follow the same steps.

 

For the last question.

mass Fe = 3.64 mol * 55.85 g/mol = 203.29 g