Given 3600 g of uranium 235 . it has a half life of 40,000 years . how much is left after 240,000 years ?

The answer to your question is: 56.25 g of Uranium

Explanation:

Data

mass  = 3600 g of Uranium 235

half life = 40000 years

How much after 240 000 years

                         3600 g of Uranium                   right now

                          1800 g                                      40 000 years

                            900 g                                     80 000 years

                            450 g                                    120 000 years

                            225 g                                    160 000 years

                            112.5 g                                   200 000 years

                            56.25 g                                 240 000 years

i think a, hope it .

explanation:

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.