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Ch.8 - Basic Concepts of Chemical Bonding
Chapter 8, Problem 81

A metal oxide has a lattice energy in the range of 3300 kJ/mol. Is the charge on the metal ion M likely to be 1+, 2+, or 3+? Explain.

Verified step by step guidance
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Step 1: Understand the concept of lattice energy. Lattice energy is the energy required to separate one mole of an ionic solid into its gaseous ions. It is influenced by the charges on the ions and the distance between them.
Step 2: Recall the relationship between lattice energy and ionic charge. Lattice energy increases with the magnitude of the charge on the ions. Higher charges result in stronger electrostatic attractions, leading to higher lattice energies.
Step 3: Consider the typical lattice energy values for different charges. Generally, compounds with 1+ and 1- charges have lower lattice energies, while those with 2+ and 2- charges have higher lattice energies. Compounds with 3+ and 3- charges have even higher lattice energies.
Step 4: Compare the given lattice energy with typical values. A lattice energy of 3300 kJ/mol is relatively high, suggesting that the metal ion likely has a higher charge, such as 2+ or 3+.
Step 5: Conclude based on the comparison. Given the high lattice energy, it is more likely that the metal ion M has a charge of 2+ or 3+, as these charges correspond to stronger ionic interactions and higher lattice energies.
Related Practice
Open Question
A new compound has a C—O bond length of 120 pm. Is this bond likely to be a single, double, or triple C—O bond?
Open Question
A new compound is made that has a C—N bond length of 118 pm. Is this bond likely to be a single, double, or triple C—N bond?
Textbook Question

Consider the lattice energies of the following Group 2A compounds: BeH2, 3205 kJ/mol; MgH2, 2791 kJ/mol; CaH2, 2410 kJ/mol; SrH2, 2250 kJ/mol; BaH2, 2121 kJ/mol. (a) What is the oxidation number of H in these compounds?

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Textbook Question

The ionic compound CaO crystallizes with the same structure as sodium chloride (Figure 8.3). (a) In this structure, how many O2- are in contact with each Ca2+ ion (Hint: Remember the pattern of ions shown in Figure 8.3 repeats over and over again in all three directions.)

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Textbook Question

Construct a Born–Haber cycle for the formation of the hypothetical compound NaCl2, where the sodium ion has a 2+ charge (the second ionization energy for sodium is given in Table 7.2). (a) How large would the lattice energy need to be for the formation of NaCl2 to be exothermic?

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Open Question
A classmate of yours is convinced that he knows everything about electronegativity. (a) In the case of atoms X and Y having different electronegativities, he says, the diatomic molecule X–Y must be polar. Is your classmate correct? (b) Your classmate says that the farther the two atoms are apart in a bond, the larger the dipole moment will be. Is your classmate correct?