The radioactive isotope i-131 is used in
a) geologic dating
b) controlling speeds of neutrons
c) controlling fission reactions
d) medical diagnosis

because of all the things that happen around the us, many people get into arguments which sadly could get physical, but we should actually make a change for that.

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.