A certain enriched sample of uranium was found to have the average atomic mass equal to 237.39 u. Assuming that it contains only two isotopes, 235U and 238U, find the abundance (in %) of 235U in that sample. The isotopic masses of 235U and 238U are 235.0439 u and 238.0508 u, respectively.

In order for a high temperature boiler or steam engine to produce superheated water, or steam: the heat source must be greater than 100°c the water must be permitted to evaporate quickly the system must be sealed and become pressurized above atmospheric pressure the vapor pressure must be kept below 760 mm(hg)