Two liquids, 'R' and 'S' form an ideal mixture, what is true about the relation between the mole fraction of R in the liquid phase (X_r) and that of the vapor phase (Y_r) for most mole fractions in the range of 0<X_r<1.
A)X_r < Y_r
B) X_r > Y_r
C)X_r = Y_r
D) X_r +Y_r = 1
is it C? since they are ideal?