what did i do wrong?
i need to find lowest vapor pressure.
a 0.13 m FeCl3
b 0.50 m sucrose
c 0.24 m NaNO3
d 0.15 m Na2PO4
so i solved.
a 4 x 0.13 = 0.52
b 1 x 0.50 = 0.50
c 5 x 0.24 = 1.2
d 7 x 0.15 = 1.05
i chose C but the answer is A. did i do something wrong?
a is ok
b is ok
c should be 2 x 0.24 = 0.48. NaNO3 ionizes into Na^+ and NO3^-.
I don't know what Na2PO4 is. Na2HPO4 will ionize to 2Na^+ and HPO4^-2 (three particles).
And that makes a the winner.