In fact, the conversion of mass to energy in the sun is not 100% efficient. as we have seen in the text, the conversion of four hydrogen atoms to one helium atom results in the conversion of about 0.02862 times the mass of a proton to energy. how much energy in joules does one such reaction produce? (see appendix e for the mass of the hydrogen atom, which, for all practical purposes, is the mass of a proton.)