Question

The half-life of a radioactive material is 12.4 hours. How much of a 750.0 gram sample is left after 62.0 hours? (Round to the nearest hundredth of a gram)​

Answer 1

23 gram remains

Explanation:

62÷12.4=5 half lives

after 5 half lives it has been reduced by 1/2×1/2×1/2×1/2×1/2=1/32

after 62 hours, 1/32×750=23 grams