Benzene is to be heated in a concentric pipe apparatus having a 1% in ip's inner pipe rom tuu w 140°f by 8000 lb/h of nitrobenzene having an initial temperature of 180°f. a value of u= 100 btu/(h-ft? .°f) may be expected based on the outside surface of the pipe. how much cold benzene can be heated in 160 lin. ft of concentric pipe: a) in countercurrent flow and b) parallel flow? cp values of benzene and nitrobenzene are 0.43 and 0.39, respectively. hint: trial-and-error solution)

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons

1 is the answer to this problem

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.

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