Whats the molar mass of potassium nitride

Answer explain why it is not possible to deduce a complete order of reactivity.

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.

How many grams of mgbr2 are needed to produce 75g or metal?