Question

Which of the following is the correct representation of relative lowering of vapour pressure ?

(a)  P^o/ΔP = P^o- P/P^o

(b)  P^o - P/P^o

(c)  P^o/P^o - P

(d)  ΔP/P^o = P^o - P/P^o

Answer 1

Correct option (d)  ΔP/P^o = P^o - P/P^o

Explanation:

Relative lowering of vapour pressure is written as : ΔP/P^o = P^o - P/P^o

P^o = Vapour pressure of pure component P = Vapour pressure of component in solution