fire.biol.wwu.edu/trent/alles/Origin_of_Elements.pdf In this source Alles gives a detailed description of the mechanism underlying Type Ia supernovas----so that one sees why they always release about the same amount of energy and can be used as standard candles for measuring distance. But he does not give the yield in joules. Can anyone calculate the yield from the assumptions on page 13 of Alles "Origin of the Elements" essay? A white dwarf consisting of carbon----no longer actively fusing----is being augmented by a red giant companion. When the dwarf reaches Chandra mass half of the carbon undergoes fusion to elements such as chromium, manganese, iron, cobalt, and nickel. The problem is to estimate how much energy this fusion yields. A more realistic assumption is that the white dwarf consists of a mixture of carbon and oxygen but this doesnt make much difference in rough calculation----anything around carbon merging to anything around iron gives about the same result.