6th grade science help me :))

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of water? '

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?

Quiz1. which physical state of nitrogen has the highest entropy? a solid© b gasoc liquid