3-2 Calculation of Activity Coefficients Calculate the ionic strength, the activity activity and osmotic pressure at 25°C of 0.01 mol L NaCl solution.
calculations is calculation of so called ionic strength using Equation 13-4)

am i too late?

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.