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Raoult's law for an ideal solution (one component A in solvent S) is:
AP_A = x_A P_A_pure
BP_total = sum of pure pressures
CP_A = x_A
DP_A = (1-x_A) P_A_pure
Answer & Solution
Correct answer: A. P_A = x_A P_A_pure
Raoult's law: partial pressure of A above solution = x_A × P_A_pure (vapour pressure of pure A). Sum over components gives total vapour pressure.
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