what is mole fraction?

At 90^(@)C , liquid A has a vapour pressure of 808 torr and liquid B has a vapour pressure of 323 torr. If A and B form an ideal solution, what is the mole fraction of liquid A in a mixture of A and B that will boil at 90^(@)C and 1 atmosphere pressure ?

If 2 is added to the denominator of a fraction we get 1/4 . If 1 is added to numerator and simplified we get 2/5 . What is the fraction?

What is the mole fraction of the solute in a 2m aqueous solution?

What is the mole fraction of the solute in a 1m aqueous solution?

What is the mole fraction of C Cl_4 in solution if 2.3 moles of C Cl_4 is dissolved in 5.7 moles of benzene?

A solution of naphthalene in benzene has a mole fraction of naphthalene equal to 0.10. What is the molality of the solution?

Relative lowering of vapour pressure, elevation of boiling point, depression of freezing point and osmotic pressure are important colligative properties of dilute solutions. Relative lowering of vapour pressure of an aqueous dilute solution of glucose is 0.018 What is the mole fraction of glucose in the solution ?