SATHEE: Solutions Question 409

Solutions Question 409

Question: An aqueous solution containing liquid A $(M . W t . = 128)$ 64% by weight has a vapour pressure of 145 mm. Find the vapour pressure of pure A. If that of water is 155 mm at the same temperature.

Options:

A) 205 mm

B) 2.05 mm

C) 1.05 mm

D) 105 mm

Show Answer

Answer:

Correct Answer: D

Solution:

According to Raoult’s law for liquid mixtures. $P = P_{A} + P_{B}$ $P = P_{A}^{0} \times \frac{\frac{W_{A}}{M_{A}}}{\frac{W_{A}}{M_{A}} + \frac{W_{B}}{M_{B}}} + P_{B}^{0} \times \frac{\frac{W_{B}}{M_{B}}}{\frac{W_{A}}{M_{A}} + \frac{W_{B}}{M_{B}}}$ $P = 145 = P_{A}^{0} \times \frac{\frac{64}{128}}{\frac{64}{128} + \frac{36}{18}} + 155 \times \frac{\frac{36}{18}}{\frac{64}{128} + \frac{36}{18}}$ $P_{A}^{0} = 105, m m$

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Solutions Question 409

Question: An aqueous solution containing liquid A (M.Wt.=128) 64% by weight has a vapour pressure of 145 mm. Find the vapour pressure of pure A. If that of water is 155 mm at the same temperature.

Options:

Answer:

Solution:

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Question: An aqueous solution containing liquid A $(M . W t . = 128)$ 64% by weight has a vapour pressure of 145 mm. Find the vapour pressure of pure A. If that of water is 155 mm at the same temperature.