Element Y has a half life of 50days. How much of a 100mg of its sample will remain after 5 month?

Answer 1

How many days in a month? Use 30?
50/30 = 1.67 months in 50 days
k = 0.693/t_1/2 and substitute k into the below equation. I used 1.67 months.

ln(No/N) = kt.
No = 100 mg
N = ? solve for this
k from above.
t = 5 months