The rate constant for this zero-order reaction is 0.0270 M s^-1 at 300 C. How long (in seconds) would it take for the concentration of A to decrease from 0.780 M to 0.220 M?

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.