The ability of iron to rust is a blank property

Chemistry worksheet - i am not sure what they are asking for exactly?

How many moles of potassium hydroxide are needed to completely react with 2.94 moles of aluminum sulfate

Click the button that shows the correct relationship of the electron affinities of the elements sodium and phosphorus. sodium’s electron affinity value is more negative than the electron affinity value of phosphorus. phosphorus’ electron affinity value is more negative than the electron affinity value of sodium. this information cannot be determined using the periodic table. answer is b on e2020.