The density of a gas is 3.21 g/l. what is the molar mass of this gas

In which layer of earth do most earthauakes occur a_ inner core b_outer core c_mantle d_crust

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.

What is the percent by mass of oxygen in fe2o3