Which of the following is a useful guideline for the application of formal charg

Question

Which of the following is a useful guideline for the application of formal charges in neutral molecules? A) A Lewis structure in which there arc no formal charges is preferred. B) Lewis structures with large formal charges (e.g., +2, +3 and/or -2, -3) are preferred. C) The preferred Lewis structure is one in which positive formal charges are on the most electronegative atoms. BcF_4^2- is called the fluoberyllate ion. The formal charge on the beryllium atom in this ion is A) -2 B) -1 C) 0 D) +1 E) +2 Which of the elements listed below is most likely to exhibit an expanded octet in us compounds? A) O B) S C) Na D) C E) N Estimate the enthalpy change for the reaction 2CO + O_2 rightarrow 2CO_2 given the following bond energies. BE(C O) = 1074 kJ/mol BE(O O) = 499 kJ/mol BE(C = O) = 802 kJ/mol A) +2380 kJ/mol B) +1949 kJ/mol C) +744 kJ/mol D) -561 kJ/mol E) -744 kJ/mol

Explanation / Answer

31. A

Neutral structures are more stable

32. A

Formal charge is charge on individual atoms

33. B

Third period elements show expanded octet.

34. None of the given options

It should be 1043Kj/mol

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