Which statement describes the particle of an ideal gas?
(1)the particles move in well-defined, circular paths
(2)when the particles collide, energy is lost
(3) there are forces of attraction between the particles
(4)the volume of the particle is negligible

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.