Question

Can anyone help with one or two of these questions? ill give brainliest

Answer 1

Answer:

1.  1.00(1/2)^151/30.2= 31.3 g

2. 24g-->1.4 g = 4 half-lives, so 4*5730= 22920 years

3.  64g-->2.0g = 5 half-lives, so 12.5/5= 2.5 hours