Dezidontcare3592 Dezidontcare3592 16-12-2017 Chemistry contestada A particular radioactive isotope has a half-life of (2.50+a) hours. if you have (24.5+b) g of the isotope at 10:00 am, how much will you have at 7:30pm? give your answer in grams (g)and with 3 significant figures.