ID: Lone Star CHEM 1411 Final Exam Fall 2017 and 85.6% carbon Analysis of a comp

Question

ID: Lone Star CHEM 1411 Final Exam Fall 2017 and 85.6% carbon Analysis of a compound showed that it contained 14.4 % hydrogen atoms atoms by mass. What is its empirical formula? SHOW WORK. -34. C) CH D) CH2 E) CH 35. What is the hybridization of the nitrogen atom in the nitrite ion? SHOW WORK. A) S B) spd C) sp D) sp E) sp 36. How many valence electrons are present in the Lewis formula for the hypochlorite ion, CIO ? A) 14 B) 16 C) 12 D) 20 E) 18 37. Which of the following electron distributions among the molecular orbitals best describes the NO A) 2 24 B) 2 2 C) 2 2 D) 2 24 E) 2 2 4 10

Explanation / Answer

34. H = 14.4/1 = 14.4 mol

    C = 85.6/12 = 7.133 mol

simplest ratio,

H = 14.4/7.133 = 2

C = 7.133/7.133 = 1

empirical formula= CH2

answer: D

35. Nitrite ion = NO2-

   N = hybridisation = no of sigma bonds + lone pairs on central atom

                     = 2+1

                     = 3 = sp2

answer: c

36. Clo- , total valence electrons = 7+6+1 = 14 e-

answer: A

37. NO = 15e-

answer: c

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