An organism that oxidizes H2S to gain energy and utilizes CO2 as a carbon source (to generate carbohydrates) would be classified as a: A. chemolithoautotroph. B. photoautotroph. C. chemolithoheterotroph. D. chemoorganoheterotroph. E. photoheterotroph.

the answer is 75.0%.

you need to have a picture of the atom that way we can answer it

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.