hmm ok well this is actually an online homework and I don't know, maybe I'm not entering the answer in correctly. I tried it twice again and got 229.17 mmHg but it's still not correct apparently. What's wrong here?
mol fraction of Ni(NO3)2 = .0194
using Raoult's Law: PA = PA°XA
∆P = 233.70 mmHg x .0194 = 4.534 mmHg
PA = 233.70 - 4.534 = 229.17 mmHg