Water & HNO3 form a non ideal solution. If 36 gm of water is mixed with 126 gm of HNO3. Vapor pressure of water and HNO3 in pure state at 298 K are 360 torr & 300 torr respectively then what could be the vapour pressure of the above solution at 298 K.

Engineering

Chemistry

Non Ideal solution

Question

Water & HNO₃ form a non ideal solution. If 36 gm of water is mixed with 126 gm of HNO₃. Vapor pressure of water and HNO₃ in pure state at 298 K are 360 torr & 300 torr respectively then what could be the vapour pressure of the above solution at 298 K.

250 torr

350 torr

370 torr

330 torr

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H₂O + HNO₃   (– ve deviation from Raoult's law)
$\frac{36}{18} = 2 mol$    $\frac{126}{63} = 2 mol$
P° = 360           P° = 300
P_solution = 0.5 × 360 + 0.5 ×300 = 330 (ideal)
P_solution (exp.) < P_solution (ideal)