What is the molar mass of babr2? multiple choice on the picture

In this synthesis reaction what products will form

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

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.