MediumChemistryVapour Pressure & RLVP
+4 / -1
A solution X contains 30 mole % of A and is in equilibrium with its vapour that contains 40 mole % of B. The ratio of vapour pressures of pure A and B will be-
A
2 : 7
B
7 : 2
C
3 : 4
D
4 : 3
Explanation
XA = 0.30 XB = 0.70 Vapour contains 40% B YA = 0.60 YB = 0.40 YA/YB = (XA P°A)/(XB P°B) 0.60/0.40 = (0.30P°A)/(0.70P°B) 3/2 = 3P°A/7P°B P°A/P°B = 7/2 Ratio = 7 : 2
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