Which bacteria is most problematic in the food industry?
pathogenic
hypoallergenic
biogenic
environmental

If you open the bottle of perfume then nothing but the smell will come out of it and yes it is a type of gas smell because it’s say it in english so i can understand better and you

Ametal with a large number of free flowing electrons most likely has good conductivity

In any atom of any element, you will find protons and neutrons in the nucleus of any atom 

Molarity is moles of solute over liters of solution. idk if that is what you are talking about, but you can convert moles of solute to grams of solute using dimensional analyzes by using molar mass found on the periodic table.