Nitrogen - 13 has a half life of 10 minutes how long will it take for a sample of 500 g to be reduced to 62.5 g?

30 minutes

Explanation:

Use half life equation:

A = A₀ (½) ^ (t / T)

where A is the final amount, A₀ is the initial amount, t is time, and T is the half life.

A = A₀ (½) ^ (t / T)

62.5 = 500 (½) ^ (t / 10)

0.125 = ½^ (t / 10)

t / 10 = 3

t = 30

It will take 30 minutes.