Dry ice pellets, the solid form of carbon dioxide, were placed in the bottom of this flask. The flask was then covered with a balloon. Within 15 minutes, there was a change in the flask, as seen here. Explain what happened to the CO2 molecules. Which image BEST provides a visual explanation?

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.