alleryFor a binary solution of volatile liquids, the total vapour pressure can be written as:
Ap_total = (p₁⁰ + p₂⁰) / 2
Bp_total = p₁⁰ + (p₂⁰ − p₁⁰) × x₂
Cp_total = p₁⁰ × p₂⁰
Dp_total = p₁⁰ + p₂⁰
Answer & Solution
Correct answer: B. p_total = p₁⁰ + (p₂⁰ − p₁⁰) × x₂
p_total = x₁ p₁⁰ + x₂ p₂⁰.
Substituting x₁ = (1 − x₂) gives **p_total = p₁⁰ + (p₂⁰ − p₁⁰) x₂** — linear in x₂.
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