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

Consider a culture medium on which only gram-positive organisms such as staphylococcus aureus colonies can grow due to an elevated nacl level. a yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the ph as a result and changing the color of a ph indicator chemical. this type of medium would be referred to as a differential and enrichment culture.