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Answers (3)
It's up to Bob. If you find anything wrong with the solution, please correct it :)
n * t1/2 = mass/(2^n) n * t1/2 = 2 hrs = 120 mins n = 120/13.3 n = 9.02 (n = number of half-cycles) remaining mass = 243/(2^9.02) = 0.467g 0.467g is remaining after 2 hrs
).5^n = 0.125 n = 3 t 1/2 = 40 mins / 3 t 1/2 = 13.3 mins Hope that helps
