What is correct relation between mole fraction in vapour phase (YA) of A in terms of XA. If mole fraction in solution of A is (XA) (If 0 PA is vapour pressure of A in pure state)

What is correct relation between mole fraction in vapour phase (YA)

1.	What is correct relation between mole fraction in vapour phase (YA) of A in terms of XA. If mole fraction in solution of A is (XA) (If 0 PA is vapour pressure of A in pure state)
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