Which chemical equation follows the law of conservation of mass

Fill in the coefficients that will balance the following reaction: a0cr2(so4)3 + a1agno3

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.

Find the number of moles of argon in 364g of argon.