2.99792458\times 10^(8)(m)/(s^(2)). One joule is equivalent to 1
kg*(m^(2))/(s^(2)).4.0?
1441100000
X J
_(92)^(239)U+_(0)^(1)n->_(51)^(133)Sb+_(41)^(98)Nb+9_(0)^(1)n
Did you recall the equation that relates mass and energy? Did you remember how to
determine the mass defect for a nuclear reaction?