Pure isooctane would have an octane rating of A) 0. B) 50. ...

[casperchen82]

Pure isooctane would have an octane rating of
 
  A) 0.
  B) 50.
  C) 75.
  D) 100.

Question 2

After five half-lives, what percentage of the original radioactive isotope remains in a sample?
 
  A) 0
  B) 50
  C) 3.13
  D) 6.25

[mcinincha279]

Answer to Question 1

D

Answer to Question 2

C

[casperchen82]

Excellent

[covalentbond]

Thanks for the timely response, appreciate it