Naturally occurring iron contains:
5.82% 54fe (atomic mass = 53.940 amu)
91.66 % 56fe (atomic mass = 55.935 amu)
2.19% 57fe (atomic mass = 56.935 amu)
0.33% 58fe (atomic mass = 57.933 amu)
calculate the average atomic mass of iron.

How many moles of gas are present if p=11 atm, v=12l, t=185k?

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.

Correct relationship between molecular formula and empirical formula