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The total surface area covered by all the molecules of the adsorbed gas is given by ____________

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The total surface area covered by all the molecules of the adsorbed gas is given by ____________

(a) S = nβ/NA

(b) S = βNA/n

(c) S = nβNA

(d) S = NA/nβ

This question was addressed to me during an online exam.

This interesting question is from B. E. T. Adsorption Isotherm in division Criteria of Purity and Characterisation of Materials of Engineering Chemistry I

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The correct option is (c) S = nβNA

To explain: The total surface area covered by all the molecules of the adsorbed gas is given by S = nβNA. The surface area occupied by a single gas molecule is inversely proportional to the density of the liquefied gas.

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