Some Basic Concepts of Chemistry - Result Question 105

####43. 20 surface sites have adsorbed N2. On heating N2 gas evolved from sites and were collected at 0.001atm and 298 K in a container of volume is 2.46cm3. Density of surface sites is 6.023×1014/cm2 and surface area is 1000cm2, find out the number of surface sites occupied per molecule of N2.

(2005,3M)

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Solution:

  1. Partial pressure of N2=0.001atm,

T=298K,V=2.46dm3.

From ideal gas law : pV=nRT

n(N2)=pVRT=0.001×2.460.082×298=107

Number of molecules of N2=6.023×1023×107

=6.023×1016

Now, total surface sites available

=6.023×1014×1000=6.023×1017

Surface sites used in adsorption =20100×6.023×1017

=2×6.023×1016

Sites occupied per molecules

= Number of sites  Number of molecules =2×6.023×10166.023×1016=2



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