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Ionic_Bonding_HW

# Ionic_Bonding_HW - Additional Homework Set 5 Ionic Bonding...

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Additional Homework Set 5 Ionic Bonding 1) Four different chromium oxide compounds exist: CrO, Cr 2 O 3 , CrO 2 , and CrO 3 . a) What is the formula weight of each? b) What is the percent composition of Cr and O of each compound? c) Rank these compounds by their lattice energies. d) Rank the compounds by their melting points. e) What is the charge on the Cr cation in each compound? f) What is the electron configuration of neutral Cr and each Cr cation? g) How many unpaired electrons are present in each cation? h) Below are the ionic radii for the four different cations of Cr. Which radius corresponds to which cation? Cation Radius (nm) 0.73 0.62 0.49 0.44 i) The density of CrO 2 is 4.9 g/cm 3 . What is the volume of 25.0 g of CrO 2 ? If this volume is a crystal with 2 sides both 1 cm long, how long is the third side? j) Given the following isotopic data, how many 53 Cr atoms will be found in 5.0 g of Cr 2 O 3 ? Isotope Mass (amu) Relative abundance (%) 50 Cr 49.94 4.345 52 Cr 51.94 83.789 53 Cr 52.94 9.501 54 Cr 53.94 2.365 k) Like in atoms, compounds have various energy levels that can be occupied by electrons.

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Ionic_Bonding_HW - Additional Homework Set 5 Ionic Bonding...

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