Why are fossil fuels a rich source of energy? fossil fuels require activation energy to burn
heat is released when fossil fuels combine with oxygen
fossil fuels are millions of years old
carbon dioxide is released when fossil fuels combine with oxygen

i need mutiple choices

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.