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Adsorption is the presence of excess concentration of any particular component at the surface of liquid a solid phase as compared to bulk.This is due to presence of residual forces at the surface of body.In the adsorption of hydrogen gas over a sample of charcoal, `1.12cm^3` of `H_2(g)` measured over S.T.P was found to absorb per gram of charcoal.Consider only monolayer adsorption.Density of `H_2` is 0.07gm/cc. In another experiment same 1 gm charcoal adsorbs 100 ml of 0.5M `CH_3COOH` to form monolayer and thereby the molarity of `CH_3COOH` reduces to 0.49. `((3xx47.43)/(4pi))^(1//3)=2.24` `(2.24)^2=5` Surface area of charcoal adsorbed by each molecule of (acetic soda) is-A. `7.8xx10^(-19) cm^2`B. `7.8xx10^(-18) cm^2`C. `7.8xx10^(-17) cm^2`D. `7.8xx10^(-16) cm^2` |
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Answer» Correct Answer - C moles of acetic acid used `=0.5xx100/1000-0.49xx100/1000=10^(-3)`moles number of molecules `=10^(-3)xx6.023xx10^23=6.023xx10^20` surface area of charcoal `=4.73xx10^4 cm^2` surface area of charchol adsorbed by each molecule`=(4.73xx10^4)/(6.023xx10^20)=7.8xx10^(-17) cm^2` |
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