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Standard XII

Physics

Carnot Cycle

57 Assuming i...

Question

57 Assuming ideal gas cvm will be temprature independent for O3 N2 Co2 He

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Q. At same pressure,temperature and volume what will be deviation for both gases

N_{2}

gas and

H e

gas.

If $P d v / s . P$ (where $P$ denotes pressure in atm and $d$ denotes density in $g m / L$ ) is plotted for $H e$ gas (assume ideal) at a particular temperature. If ${[\frac{d}{d P} (P d)]}_{P = 8.21 a t m} = 5$ , then the temperature will be:

Q. A

5 l i t

flask containing

N_{2}

1

bar and

25^{o} C

is connected to a

4 l i t

flask containing

N_{2}

2

bar and

0^{o} C

. After the gases are allowed to mix keeping both flasks at their original temperature, what will be the pressure and amount of

N_{2}

in the

5 l i t

flask assuming ideal gas behaviour.

Q. Assertion :At low temperature (say

0^{o} C

) the effect of attractive forces dominates for

C O_{2}, C H_{4}

and

N_{2}

, whereas the molecular size effect dominates for

H_{2}

and He to explain deviations. Reason:

Z > 1

for

H_{2}

and He, whereas Z < 1 for

C O_{2}, C H_{4}

and

N_{2}

Q. The second law of Thermodynamics is a fundamental law of science. In this problem, we consider the Thermodynamics of an ideal gas, phase transition and chemical equilibrium.
Three moles of

C O_{2}

gas expands isothermally (in thermal contact with the surroundings; temperature

= {15.0}^{\circ} C

) against a fixed external pressure of

1.00 b a r

. The initial and final volumes of the gas are

10.0 L

and

30.0 L

, respectively.

Assuming

C O_{2}

to be an ideal gas,

Δ_{s y s} S

is:

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