What is the half-life of an isotope if 125 g of a 500 g sample of the isotope remains after 3.0 years?

a.) 3.5 years

b.) 4.5 years

c.) 1.5 years

d.) 2.5 years

Question

Thelma

9 April, 15:47

+3

Answers (1)

Know the Answer?

Kendall Harper · Answer 1

C.) 1.5 years.

500 divided by half twice = 125, so there are two half lives. In 3.0 years, two half lives would equal 1.5 years.

What is the half-life of an isotope if 125 g of a 500 g sample of the isotope remains after 3.0 years?a.) 3.5 yearsb.) 4.5 yearsc.) 1.5 yearsd.) 2.5 years