How do i solve this? step by step would be great

Which statement is usually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.

What is the molar mass of potassium nitrate, kno3

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?