Stoichiometry
A very dilute solution is prepared by dissolving 'x1' mole of solute in 'x2' mole of a solvent. The mole fraction of solute is approximately equal to

X1/x2
1 - (x1/x2)
1/x2
X2/x1

ANSWER DOWNLOAD EXAMIANS APP

Stoichiometry
The boiling points for pure water and pure toluene are 100°C and 110.6°C respectively. Toluene and water are completely immiscible in each other. A well agitated equimolar mixture of toluene and water are prepared. If, at a total pressure of one standard atm. exerted by the vapours of water and toluene, the mole fraction of water Xw in the vapour phase satisfies

0.5 < Xw < 1.0
0 < Xw < 0.5
Xw = 0.5
Xw = 1.0

ANSWER DOWNLOAD EXAMIANS APP