LEARN MORE REMARKS The calculation implicitly assumes perfect conversion to usable power, which is never the case in real systems. Enough uranium deposits are known so as to provide the world's current energy requirements for a few hundred years. Breeder reactor technology can greatly extend those reserves. QUESTION Estimate the average mass of 235U needed to provide power for the average American family for one year. _kg P RACTIC E IT Use the worked example above to help you solve this problem. (a) Calculate the total energy released if 1.02 kg of 235U undergoes ssion, taking the disintegration energy per event to be Q = 208 MeV. (b) How many kilograms of 235U would be needed to satisfy the world's annual energy consumption {about 4.0x1020 J)? EXERCISE HINTS: GETTINGSTARTED I I'M STUCK! How long can 1.02 kg of uranium-235 keep a 75 watt lightbulb burning if all its released energy is converted to electrical energy