Xnx=5Px0=63Yny=10Py0=78 Ps( calc.) =Px0xx+Py0Xy=1563×5+78×1510=21+52=73Ps (obs.) =70Ps (obs.) <Ps (calc.) -ve deviation
5 moles of liquid X and 10 moles of liquid Y make a solution having a vapour pressure of 70 torr. The vapour pressures of pure X and Y are 63 torr and 78 torr respectively. Which of the following is true regarding the described solution?
Held on 30 Apr 2025 · Verified 9 Jul 2026.
The solution shows positive deviation.
The solution shows negative deviation.
The solution is ideal.
The solution has volume greater than the sum of individual volumes.
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