20. The activity of isovaleric acid, if the surface tension of its 0.12 M solution is 44.7*10-3 N/m, and the surface tension of water is 73.0*10-3 N/m.

If you cannot open the file or have any problems, do not rush to leave a negative review! Contact me and I will quickly help you solve the problem. After purchasing, please leave a positive review of the product :)