In a sample of uo 2, the uranium has been enriched so that 3.0% of it is 235u. how long could the fissioning of the uranium in this 1.0 kg sample keep a 100 w lamp burning?

Explanation:

Molecular mass of is the sum of molecular mass of U and molecule.

             Molar mass of = (238 + 32) g/mol

                                                                  = 270 g/mol

Hence, in 1 kg there are 1000 grams. So, total number of atoms given molecules present in 1 kg will be calculated as follows.

                     =

Hence, number of =

                                            =

Now, let x seconds is required for burning 100 W lamp bulb. As 200 MeV is released per reaction.

             100 x =  

                    x = sec

Converting this value of x into years as follows.

                       x =

                    x = years

Thus, we can conclude that fissioning of the uranium in given situation requires years to keep a 100 W lamp burning.

- decrease the number of plants and animals living in the water.