7.41. A compound with a molar mass of about 42 g/mol contains 85.7% carbon and 14.3% hydrogen by mass. Write the Lewis structure for a molecule of the compound.
7.78. The reaction of a metal, M, with a halogen, X2, proceeds by an exothermic reaction as indicated by this equation: M(?)+X2(?)⟶MX2(?).M(s)+X2(g)⟶MX2(s).
For each of the following, indicate which option will make the reaction more exothermic. Explain your answers.
(a) a large radius vs. a small radius for M+2
(b) a high ionization energy vs. a low ionization energy for M
(c) an increasing bond energy for the halogen
(d) a decreasing electron affinity for the halogen
(e) an increasing size of the anion formed by the halogen
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