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Depression in Freezing Point

Which of the ...

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Which of the following contains the least number of molecules ? a) 4.4 g of CO2 b) 1.4 g of N2 c) 2 g of H2 d) 1 g of O2

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C O_{2}

and 2.24 litre of

H_{2}

at STP are mixed in a container. The total number of molecules present in the container will be:

S T P

the order of mean square velocity of molecules of

H_{2}, N_{2}, O_{2}

H B r

Q. A gaseous mixture contains

O_{2}

N_{2}

in the ratio of 1:4 by weight. The ratio of their number of molecules is:

Q. Three closed vessels A, B and C are the same temperature T and contains gases which obey Maxwell distribution law of speeds. Vessel A contains

O_{2}

N_{2}

and C contain a mixture of equal quantities of

O_{2}

N_{2}

. If the average speed of the molecules of

O_{2}

u_{1}

N_{2}

molecules in the vessel B is

u_{2}

, the average speed of the molecules of

O_{2}

in vessel C is:

A, B

C

are three cylinders of volume 11.2 L each.

H_{2}, O_{2}

N_{2}

gases at STP are filled in

A, B

C

respectively.
(a) Find the number of moles of

H_{2}

A

.
(b) Calculate the number of molecules of

O_{2}

B . (c) I f t h e v o l u m e o f

, p r e s e n t i n

i s d o u b l e d a t S T P, c a l c u l a t e t h e m a s s i n g r a m o f

g a s . [g i v e n : M o l a r v o l u m e a t S T P

L, A t . m a s s :

H = 1,\ O= 16,\ N = 14$]

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