Why must the number of electrons lost equal the number of electrons gained in every redox reaction

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

elements make up everything, and they combine to make compounds.

the answer is c