Ch.2 - Atoms, Molecules, and Ions

Brown - Chemistry: The Central Science 15th Edition

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Brown 15th Edition

Ch.2 - Atoms, Molecules, and Ions

Problema 19b

Capitolo 2, Problema 19b

The radius of an atom of gold (Au) is about 1.35 Å. b. How many gold atoms would have to be lined up to span 1.0 mm?

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Convert the radius of a gold atom from angstroms to millimeters. Recall that 1 Å = 1 imes 10^{-10} meters and 1 mm = 1 imes 10^{-3} meters.

Calculate the diameter of a gold atom by multiplying the radius by 2, as the diameter is twice the radius.

Determine how many gold atom diameters fit into 1.0 mm by dividing 1.0 mm by the diameter of a gold atom in millimeters.

Since the question asks for the number of atoms, not diameters, and each diameter represents one atom, the result from the previous step represents the number of gold atoms needed to span 1.0 mm.

Ensure the final answer is in whole numbers since you cannot have a fraction of an atom in this context.

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Atomic Radius

The atomic radius is a measure of the size of an atom, typically defined as the distance from the nucleus to the outermost electron shell. For gold (Au), the atomic radius is approximately 1.35 Å (angstroms), which is a unit of length equal to 10^-10 meters. Understanding atomic radius is crucial for calculating how many atoms can fit into a given length.

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02:02

Atomic Radius

Unit Conversion

Unit conversion is the process of converting a quantity expressed in one unit to another unit. In this question, it is necessary to convert the length from millimeters (mm) to angstroms (Å) to match the units of the atomic radius. Since 1 mm equals 10^7 Å, this conversion is essential for accurately determining the number of gold atoms that can span the specified distance.

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01:56

Conversion Factors

Avogadro's Number

Avogadro's number, approximately 6.022 x 10^23, is the number of atoms, ions, or molecules in one mole of a substance. While not directly needed for this specific calculation, understanding Avogadro's number is fundamental in chemistry for relating macroscopic measurements to atomic-scale quantities. It provides context for the scale of atoms and helps in visualizing how many atoms are involved in larger quantities.

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02:11

Avogadro's Law

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