The half-life of Francium-212 is 19 minutes. How many minutes will it take for 1 gram of this isotope to decay to 0.125 grams?
Plz hurry

Compare the valence electron configuration of the nobles gas elements seen here. what statement is correct?

Asolution contains 225 g of sodium chloride, nacl, dissolved in enough water to make a 0.25 l of solution. what is the molarity of the solution?

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.