The half-life of a radioactive isotope is 20.0 minutes. what is the total amount of a 1.00-gram sample of this isotope remaining after 1.00 hour?

We solve this problem by using the equation as shown: A=Aoe^-(ln2/t)T where A is the final amount (1.00 g), Ao is the initial amount (which is our unknown ), t is the half-life (20.0 minutes) and lastly T time elapsed (1 h or 60 minutes). Plug in the values in the equation and you should get 8.00 grams. 

1. why does the same side of the moon always face earthc.the rotational period of the moon is equal to one revolution around earth2. which is greater the moons period of rotation or its period of revolution  b.the moons revolution period around earth3.what was the major accomplishment of the apollo missions  c.sending the first human into space4. which of these space missions involved the deployment of lunar roversa. voyager 15. which scientists are going to explore next on kepler-186fd. evidence of existence of life6.which mission is not going to explore the outside of the solar  systemb.safir7.which technology limit the future of space explorationb. scientist must first develop certain technologies before missions can be completed.