I just want to know the answer

Ill give brainiestif one neutron initiates a fission event that produces two neutrons in the products, how many new reactions can now be initiated? if each of the neutrons produced in the first fission event then initiates a fission event that produces one neutron in the products, how many new reactions can now be initiated by each neutron? how many neutrons in total were produced by the two fission events described?

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

How many moles are in 43.9 l of oxygen