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.

the answer is na (sodium)

< > according to newton's third law of motion, forces always act in equal but opposite pairs. another way of saying this is for every action, there is an equal but opposite reaction.< >