It has been estimated that the Earth contains 109 metric tons of natural uranium that can be mined economically. Of this total, 0.7% is 235U that can be fissioned to produce energy. Assume 208 MeV per fission; 1 MeV = 1.6x10-13 J; 235 g of U has 6x1023 atoms. (15%)
a. How many atoms of 235U are there in 109 metric tons of natural uranium?
b. What is the energy release possible from the 235U in 109 metric tons of natural uranium?
c. If all the world's current power needs (7x1012 W) were supplied by 235U fission, how long would this supply of uranium last?