74. According to the reference table, which sequence correctly places the elements in order
of increasing jonization energy?
(1) H=>Li->Na →K
(2) Br->C1F
(3) 0S >Se Te
(4) HBeAl-Ga

Find the mass in grams of 1.37x1020 particles of h3po4

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?