Ch.13 - Solids & Modern Materials

Tro - Chemistry: A Molecular Approach 6th Edition

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Tro 6th Edition

Ch.13 - Solids & Modern Materials

Problem 50

Chapter 13, Problem 50

An oxide of rhenium crystallizes with the unit cell shown here (rhenium=gray; oxygen=red). What is the formula of the oxide?

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Identify the type of unit cell and the positions of the atoms within the unit cell.

Count the number of rhenium atoms in the unit cell. Consider atoms at corners, edges, faces, and within the cell.

Count the number of oxygen atoms in the unit cell. Consider atoms at corners, edges, faces, and within the cell.

Determine the ratio of rhenium to oxygen atoms in the unit cell.

Use the ratio to write the empirical formula of the oxide.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Unit Cell Structure

A unit cell is the smallest repeating unit in a crystal lattice that reflects the symmetry and structure of the entire crystal. Understanding the arrangement of atoms within the unit cell is crucial for determining the overall composition and formula of the compound. In this case, the positions of rhenium and oxygen atoms within the unit cell will help deduce the stoichiometry of the oxide.

Stoichiometry

Stoichiometry involves the calculation of reactants and products in chemical reactions, based on the conservation of mass. In the context of determining the formula of a compound, it refers to the ratio of different elements present in the compound. By analyzing the number of rhenium and oxygen atoms in the unit cell, one can derive the empirical formula of the oxide.

Oxide Compounds

Oxides are compounds formed by the reaction of oxygen with another element, typically resulting in a binary compound. The properties and formulas of oxides can vary significantly based on the oxidation states of the metal involved. In this case, understanding the common oxidation states of rhenium will aid in predicting the possible formula of the rhenium oxide based on its crystal structure.

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Oxide Reactions

Related Practice

Textbook Question

Which solid in each pair has the higher melting point and why? d. NaCl(s) or CaO(s)

Textbook Question

Classify each of the following as a component of a silicate ceramic, an oxide ceramic, or a nonoxide ceramic. a. B₄C

Textbook Question

Which solid in each pair has the higher melting point and why?

a. TiO₂(s) or HOOH(s)

b. CCl₄(s) or SiCl₄(s)

c. Kr(s) or Xe(s)

Textbook Question

Identify the structure of each of the two unit cells shown in Problem 52 as the rock salt structure, zinc blende structure, fluorite structure, antifluorite structure, or none of these.

Textbook Question

Which solid in each pair has the higher melting point and why?

a. Fe(s) or CCl₄(s)

b. KCl(s) or HCl(s)

c. Ti(s) or Ne(s)

d. H₂O(s) or H₂S(s)

Textbook Question

Classify each of the following as a component of a silicate ceramic, an oxide ceramic, or a nonoxide ceramic. b. Mg₂SiO₄