help in chemistry?

Question

1. A chemists determines that a sample of petrified wood is 4.50 X 103 years old. What is the rate of decay, in counts per minute per gram, of carbon-14 in the sample? The decay rate of carbon-14 in wood today is 13.6 counts per minute per gram, and the half life of carbon-14 is 5730 years.

2. Capture of an electron by iron-55 produces what new element or isotope ?

Answer 1

1) 7.89 counts per minute per gram

2) Manganese-55 (Mn-55)