For instance, what happens to mass of an electron as all of its electromagnetic force is used to generate visible light in the combustion process? Photons do not carry mass, so then where does it go? Also when electricity is generated from solar radiation, where does it get its mass from? Electricity is composed of leptons right? Mass quantity cannot be created or destroyed and surely 1 does not come out of 0.. or does it
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The entire process is mass and energy constantly being turned into each other. A photon does have a mass equivalent. That's the amount of mass a particle loses when it emits that photon. When a particle absorbs a photon or reduces it to a lower energy, the particle gains mass. Mass and energy aren't created or destroyed. They're just transformed into one another.