Oi is initial aimouiit 15. uay the half-life period of uranium is 4.5 billion years. after 9.0 billion years, the number of mo les of helium liberated from the

oI IS initial aimouiit 15. uay The half-life period of Uranium is 4.5 billion years. After 9.0 billion years, the number of mo les of Helium liberated from the following nuclear reaction will be: 92U4 90Th254 + 2He