Platinum nanoparticles of diameter ∼2 nm are important catalysts in carbon monoxide oxidation to carbon dioxide. Platinum crystallizes in a face-centered cubic arrangement with an edge length of 3.924 Å. Estimate how many platinum atoms are on the surface of a 2.0-nm Pt sphere, using the surface area of a sphere 14pr22 and assuming that the “footprint” of one Pt atom can be estimated from its atomic diameter of 2.8 A ° .

Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Platinum nanoparticles of diameter ∼2 nm are important catalysts in carbon monoxide oxidation to carbon dioxide. Platinum crystallizes in a face-centered cubic arrangement with an edge length of 3.924 Å. Estimate how many platinum atoms are on the surface of a 2.0-nm Pt sphere, using the surface area of a sphere 14pr22 and assuming that the “footprint” of one Pt atom can be estimated from its atomic diameter of 2.8 A ° .

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Step 1

(a)

For face-centered cubic crystal lattice, the relationship between radius and edge length is given below.

Chemistry homework question answer, step 1, image 1

The value of radius for platinum atom can be obtained by putting the value of edge length in the above expression.

Chemistry homework question answer, step 1, image 2

The volume of Pt atoms is calculated by the formula,

Chemistry homework question answer, step 1, image 3

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