What is the energy of a 8.66 x 1014 Hz wave?

Which of these is a physical property

Which aqueous solution of ki freezes at the lowest temperature? 1) 1 mol of ki in 500. g of water 2) 2 mol of ki in 500. g of water 3) 1 mol of ki in 1000. g of water 4) 2 mol of ki in 1000. g of water

Which of the four hypothetical substances you investigated would be most harmful to living organisms? 50 points!