Concept explainers
The smallest repeating unit of a crystal of common salt is a cube (called a unit cell) with an edge length of 0.563 nm.
- (a) What is the volume of this cube in cubic nanometers? In cubic centimeters?
- (b) The density of NaCl is 2.17 g/cm3. What is the mass of this smallest repeating unit (“unit cell”)?
- (c) Each repeating unit is composed of four NaCl units. What is the mass of one NaCl formula unit?
(a)
Interpretation: The volume of this cube in cubic nanometers.
Concept Introduction:
Density: Is a characteristic property of a substance. The density of a substance is the relationship between the mass of the substance and how much space it takes up (volume).
Answer to Problem 43GQ
The volume is
Explanation of Solution
The volume in nanometers is
(b)
Interpretation: The volume of this cube in cubic nanometers.
Concept Introduction:
Density: Is a characteristic property of a substance. The density of a substance is the relationship between the mass of the substance and how much space it takes up (volume).
Answer to Problem 43GQ
Mass of the smallest repeating unit is
Explanation of Solution
The obtained mass of the smallest repeating unit is
(c)
Interpretation: The volume of this cube in cubic nanometers.
Concept Introduction:
Density: Is a characteristic property of a substance. The density of a substance is the relationship between the mass of the substance and how much space it takes up (volume).
Answer to Problem 43GQ
Mass of one formula unit is
Explanation of Solution
The obtained mass of one formula unit is
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