How many moles of electrons are required to reduce one mole of bromine gas (br2) to two moles of bromide ions ( 1 e- 2 e- 3 e- 4 e-

The correct answer would be the second option. It would would need 2 moles of electrons to reduce one mole of bromine gas into two moles of the bromide ions. This is a reduction reaction. It would be written as:

Br2 = 2Br- + 2e-

Must be negative.substance increases