SATHEE: Solutions Question 262

Solutions Question 262

Question: The degree of dissociation of $C a {(N O_{3})}_{2}$ in a dilute solution containing 14 g of the salt per 200 g of water at $100^{\circ} C$ is 70%. If the vapour pressure of water is 760 mmHg, calculate the vapour pressure of solution.

Options:

A) 750.6 mmHg

B) 755.8 mmHg

C) 745.98 mmHg

D) 739.56 mmHg

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Answer:

Correct Answer: C

Solution:

$Δ p_{t h e o .} =$ Lowering in vapour pressure when there is no dissocation $= p_{0} \times \frac{w M}{W m}$ (given, $p_{0} = 760 m m$ , w=14g, W=200gm M=18, m=164) $= \frac{760 \times 14 \times 18}{200 \times 164} = 5.84 m m$ Degree of dissociation $α = \frac{70}{100} = 0.7$

$C a {(N O_{3})}_{2} \to C a^{2 +} + 2 N {O^{-}}_{3}$

$(n = 3)$

$i = 1 + (n - 1) α$

$= 1 + (3 - 1) 0.7 = 2.4$ Also, $i = \frac{Δ p_{o b s .}}{Δ p_{t h e o .}}$

$= \frac{N o . of particles after dissociation}{N o . of particles when there is no dissociation}$ So. $Δ p_{o b s} = 2.4 \times Δ p_{t h e o .} = 2.4 \times 5.84$

$= 14.02 m m$

$p_{0} - p_{s} = Δ p_{o b s} = 14.02$

$p_{s} = p_{0} - 14.02 = 760 - 14.02 = 745.98 m m H g$

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Solutions Question 262

Question: The degree of dissociation of $C a {(N O_{3})}_{2}$ in a dilute solution containing 14 g of the salt per 200 g of water at $100^{\circ} C$ is 70%. If the vapour pressure of water is 760 mmHg, calculate the vapour pressure of solution.

Options:

Answer:

Solution:

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Solutions Question 262

Question: The degree of dissociation of Ca(NO3)2 in a dilute solution containing 14 g of the salt per 200 g of water at 100∘C is 70%. If the vapour pressure of water is 760 mmHg, calculate the vapour pressure of solution.

Options:

Answer:

Solution:

इंजीनियरिंग की तैयारी

चिकित्सा तैयारी

एनसीईआरटी पुस्तकें और समाधान

महत्वपूर्ण संसाधन

अन्य संसाधन

पाठ्यक्रम

परीक्षा मंच

नमूना मॉक टेस्ट

सदस्यता

एनसीईआरटी व्यायाम वीडियो समाधान

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Question: The degree of dissociation of $C a {(N O_{3})}_{2}$ in a dilute solution containing 14 g of the salt per 200 g of water at $100^{\circ} C$ is 70%. If the vapour pressure of water is 760 mmHg, calculate the vapour pressure of solution.