GKFix MCQ Question

What is the formula for total vapour pressure of a binary solution?

• A. ptotal = x1 p2⁰ + x2 p1⁰
• B. ptotal = x1 p1⁰ - x2 p2⁰
• C. ptotal = x1 p2⁰ - x2 p1⁰
• D. ptotal = x1 p1⁰ + x2 p2⁰