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Question

One gram of charcoal adsorbs 100 mL of 0.5 MCH3COOH to form a monolayer and thereby the molarity of acetic acid is reduced to 0.49 M. Calculate the surface area of the charcoal adsorbed by each molecule of acetic acid. Surface area of charcoal =3.01×102m2/gm.

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Solution

Moles of CH3COOH absorbed = Initial moles -Final moles.
=0.5×100×1030.049×100×103
=0.050.049=0.001
No. of molecules of CH3COOHabsorbed =0.001×6.02×1023
=6.02×1020
Surface area =3.01×102m2 (given)
Surface area of charcol absorbed by in each molecule of CH3COOH=3.01×1026.02×1020=5×1019m2

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