pA and pB are the vapour pressure of pure liquid components, A and B, respectively of an ideal binary solution.
If XA represents the mole fraction of component A, the total pressure of the solution will be:
1. pA + XA (pB-pA)
2. pA + XA (pA-pB)
3. pB + XA (pB-pA)
4. pB + XA (pA-pB)
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