For 1.8 mole of the radioactive isotope xenon-133, half-life = 5.3 days, how many disintegrations have

Question

occurred after 10 minutes?

Answer 1

M = Mo(1/2)^t/5.3, t in days
5.3 days = 5.3*24*60 = 7632 min.
∆M = Mo - M = 1.8(1 - (1/2)^10/7632)
∆M = 0.001634039 moles
N = 6.02214179e+23 atoms/mole
N∆M = 9.840414e+20 disintegrations
(984,000,000,000,000,000,000)