What is the mass of an original 5.60-gram sample of iron-53 that remains unchanged after 25.53 minutes?

Answer is 0.7 g

Reason: Given: mass of Fe = 5.60 gWe know that, half life of Fe-53 = t1/2 (Fe-53) = 8.51 min.

Thus, after 25.53 mins, number of half life passed = 25.53/8.51 = 3

Now, Amount left after first half life = 5.60g/2 = 2.80 g

Amount left after second half life = 2.80g/2 = 1.40 g

Amount left after third half-life = 1.40g/2 = 0.7g.