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Are u Ignou student??? Answer will be 1.09*10^-5pi.....first calculate v^2 them substitute the value in. 1/3pvLambda....at stp T=273k and volume is 22.4,litre or 22.4*10^-3 m^3.......calculate v by the formula V^2= kbT/m. u can write m=pv/Na where Na is avagadro number......hope u will get it
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