1)Mass to Moles: Moles in 84.6 g of CO2

2)Particles to Moles: Moles for 3.72*1024 atoms of Fe

3)Gas Volume (at STP) to Moles: 18.6 L of O2 to moles

4)Moles to particles: Molecules in 0.64 moles of CH4

5)Moles to Gas Volume(at SPT): Volume of 2.6 mol of NO2