Find the molarity of 85.0 g of C6H12O6 in 500 mL of solution

Use a magnet to separate iron, evaporate water, i'm not sure how to separate the other two i'm sorry but good luck

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.

The answer this would be radiative zone

So the main goal for the elements is stability which is a complete/full valence shell and typically the magic number for a stable element is 8 valence electron but not always. so elements to the left of the periodic table tend to be way less stable then those on the right, so the elements on the left are much more reactive.