if an azithromycin formulation contains 500mg of azithromycin and sterile water is added to make 5ml of the formulation, how much must be removed for a dosage of 80mg

This element exists in adundance in the sun.explain how you would go about capturing sunlight.would this captured sunlight contain any of the element?

Can someone me with questions 15 to 17 plz.

Consider the following reactions. (note: (s) = solid, (l) = liquid, and (g) = gas.) mg(s) + ½o2(g) → mgo(s) + 146 kcal/mole h2(g) + ½o2(g) → h2o(g), δh = -57.82 kcal/mole what type of reaction is represented by the previous two examples?