a hypothetical element consists of two isotopes of masses 79.95 amu and 81.95 amu with abundance's of 31.3% and 68.7%, respectively. what is the average atomic mass of this element

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.