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Evaporation

Gases possess...

Question

Gases possess characteristic critical temperature which depends upon the magnitude of intermolecular forces between the gas particles. Critical temperatures of ammonia and carbon dioxide are $405.5 K$ and $304.10 K$ respectively. Which of these gases will liquify first when you start cooling from $500 K$ to their critical temperature?

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Solution

Critical temperature
Higher is the critical temperature of a gas, easier is its liquefaction. This means that the intermolecular forces of attraction between the molecules of a gas are directly proportional to its critical temperature.

Hence, Ammonia will liquify first because its critical temperature will be reached first. Liquefaction of $C O_{2}$ will require more cooling.

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Similar questions

Gases posses charcteristic critical temperature which depends upo the magnitude of intermolecular forces between the particles. Following are the critical temperatures of some gases.

$\begin{matrix} G a s e s & H_{2} & H e & O_{2} & N_{2} C r i t i c a l t e m p e r a t u r e i n K e l v i n & 33.2 & 5.3 & 154.3 & 126 \end{matrix}$

From the above data what would be the order of liquefaction of these gases? Start writing the order from the gas liquefying first

(a) $H_{2}, H e, O_{2}, N_{2}$ (b) $H e, O_{2}, H_{2}, N_{2}$

(c) $N_{2}, O_{2}, H e, H_{2},$ (d) $O_{2}, N_{2}, H_{2}, H e$

Q. Critical temperature for carbon dioxide and methane are

{31.1}^{\circ} C

- {81.9}^{\circ} C

respectively. Which of these has stronger intermolecular forces and why?

Q. gases possess characteristic critical temperature which depends upon the magnitude of intermolecular forces between the gas particles. Critical temperatures of ammonia and CO₂ are 405.5K and 304.10 K respectively. Which of these gases will liquify at 350K? Give reasons.

Q. Gases possess characteristic critical temperature which depends upon the magnitude of intermolecular forces between the particles. Following are the critical temperatures of some gases.

Gases	$H_{2}$	$H e$	$O_{2}$	$N_{2}$
Critical temperature $(K)$	$33.2$	$5.3$	$154.3$	$126$

From the above data what would be the order of liquefaction of these gases? Start writing the order from the gas liquefying first.

Q. Assertion :On cooling, ammonia liquifies first whereas

C O_{2}

requires more cooling. Reason: Critical temperatures of ammonia and carbon dioxide are

405.5 K

304.10 K

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