Calculate the mass percent of a solution prepared by dissolving 17.2 g of NaCl in 149 g of water

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of water? '

What is the binding energy of a nucleus that has a mass defect of 5.81*10-^29 kg a 5.23*10-^12 j b 3.15* 10^12 j c 1.57*10-3 j d 9.44*10^20 j

How can the periodic table be used to predict the behavior of elements?