All the balls described below are the same size. Which of the balls has the highest density? A. a ball filled with plastic
B. a ball filled with feathers
C. a ball filled with air
D. a ball filled with solid metal

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.