What mass of propane (C3H8) must be burned in a barbecue grill to release 4560 kJ of heat?

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?

Nonpoint source pollution is difficult to control because it

Correct relationship between molecular formula and empirical formula