Question

A vapor pressure of toluene of 21 mm Hg, at 760 mm Hg, what is the equilibrium concentration for toluene?

Answer 1

Do you have a constant for toluene? (Henry's Law constant?)
p = Kc*C
p/Kc = C

Answer 2

no

Answer 3

If you have an answer to the problem I can calculate the constant.