When CO(g) is nondissociatively chemisorbed on the (111) plane of a Pt crystal at 300 K, the maximum amount of CO adsorbed is 2.3 × 10−9 mol per cm2 of surface. (a) How many adsorption sites does this surface have per cm2? (b) The product Pt of the gas pressure and the time the solid surface is exposed to this pressure is often measured in units of langmuirs, where one langmuir (L) equals 10−6 torr ∙ s. When a clean Pt(111) surface of area 5.00 cm2 is exposed to 0.43 langmuir of CO(g) at 300 K, 9.2 × 10−10 mol of CO is chemisorbed. Find the fraction θ of occupied sites. Estimate s0, the sticking coefficient at θ = 0.
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