A gas mixture consists of 2 moles of oxygen and 4 moles of a argon at temperature T. Neglecting all vibrational modes, the total internal energy of the system is –

(A) 4RT                         

(B) 5RT

(C) 15RT                       

(D) 11RT

Concept Questions :-

Kinetic Theory of Gas
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Given reaction : Cs + H2Og  COg + H2g. Calculate the volume at STP from 48 gm of carbon and excess H2O-

(A) 179.2 lit.                           

(B) 89.6 lit.

(C) 44.8 lit.                             

(D) 22.4 lit.

Concept Questions :-

Ideal Gas Law
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Two gases occupy two containers A and B the gas in A, of volume 0.10 m3, exerts a pressure of 1.40 MPa and that in B of volume 0.15 m3 exerts a pressure 0.7 MPa. The two containers are united by a tube of negligible volume and the gases are allowed to intermingle. Then if the temperature remains constant, the final pressure in the container will be (in MPa)

(A) 0.70                               

(B) 0.98

(C) 1.40                               

(D) 210

Concept Questions :-

Ideal Gas Law
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The average molecular weight of air is 28.8 g mol1. At 20ºC, the pressure of air at a height of 6 km is half of that at the sea level. Assuming that air contains minute quantities of hydrogen, at what height the partial pressure of hydrogen would be one fourth of the partial pressure at the sea level ? The temperature may be assumed to be the same.

(A) 172.8 km                           

(B) 4.8 km

(C) 86.4 km                             

(D) 9.6 km

Concept Questions :-

Ideal Gas Law
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2.3 grams of a mixture of NO2 and N2O4 have a pressure of 0.82 atm at temperature, T K and volume, V litres. If VT=1300magnitude, calculate PNO2. Assume that all the NO2 was formed N2O4.

(A) 0.52 atm                             

(B) 0.38 atm

(C) 0.19 atm                             

(D) 0.41 atm

Concept Questions :-

Dalton's Law
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At a certain temperature for which RT = 25 lit. atm. mol1, the density of a gas, in gm lit1, is d = 2.00 P + 0.020 P2, where P is the pressure in atmosphere. The molecular weight of the gas in gm mol1 is

(A) 25                                 

(B) 50

(C) 75                                 

(D) 10

Concept Questions :-

Ideal Gas Law
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An evacuated glass vessel weighs 50.0 g when empty, 148.0 g when filled with a liquid of density 0.98 g mL1 and 50.5 g when filled with an ideal gas at 760 mm Hg at 300 K. Determine the molar mass or the gas.

(A) 113 g mol1                              

(B) 132 g mol1

(C) 123 g mol1                              

(D) 145 g mol1

Concept Questions :-

Ideal Gas Law
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The average speed at T1 (in kelvin) and the most probable speed at T2 (in kelvin) of CO2 gas is 9.0 × 104 cm s1. Calculate the values of T1 and T2.

(A) 1682.5 K, 2143.4 K                     

(B) 1312.5 K, 1243.4 K

(C) 1881.5 K, 2233.4 K                     

(D) 1712.5 K, 24.13.4 K

Concept Questions :-

Molecular Velocity
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Two flasks of equal volume connected by a narrow tube (of negligible volume) at 27ºC and contain 0.70 mole of H2 at 0.5 atm. One of the flasks is then immersed into a hot bath, kept at 127ºC, while the other remains at 27ºC. Calculate the final pressure.

(A) 5.714 atm                   

(B) 0.5714 atm

(C) 2.5214 atm                 

(D) 5.5114 atm

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A gas bulb of 1 litre capacity contains 2.0 × 1021 molecules of nitrogen exerting a pressure of 7.57 × 103 Nm2. Calculate the root mean square (rms) speed and the temperature of the gas molecules. If the ratio of most probable speed to the root mean square speed is 0.84, calculate the most probable speed for these molecules at this temperature.

(A) 41.54 m s1                               

(B) 125.14 m s1

(C) 315.12 m s1                              

(D) 415.14 m s1

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