Answer:
25 g
Explanation:
N/No = (1/2)^t/t1/2
N= amount of radioactive material at time t
No = amount of radioactive material initially present
t= time taken
t1/2 = half life of the radioactive material
Substituting values;
N/800 = (1/2)^80/16
N/800= (1/2)^5
N/800= 1/32
32N = 800
N= 800/32
N= 25 g
