1. A balloon filled with helium gas has a volume of 5.00 L at a pressure of 1.00 atm. The balloon is released and reaches an altitude of 6.5 km where the pressure is 0.50
atm. Assuming that the temperature is constant, what volume does the gas occupy at
this height?

i think a, hope it .

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.