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

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-

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