2. The remnant of a Type II core-collapse supernova is powered by the decays of 5Ni to 56Co to "Fe via the reactions 56Ni -> 56Co + et + v -> 56Fe tet + v. The reaction 56Co - 56Fe tet + v has a half-life of 77.27 days and emits 4.56 Mev of energy per decay. Assuming that every 56Co is produced by the decay of a 5Ni and that the peak absolute bolometric magnitude of the supernova is Mol=-20, calculate the mass in Mo of 56Ni that must have formed as a result of the explosion