11,12,13 poihts.Calculate the standard refractive index.11. An unknown sample is being submitted for elemental analysis. The follow-ing results are obtained: 72.4 % C, 13.8 % H and 0 % N. Knowing that thesample's molecular weight is 116, what is the molecular formula of this com-pound? Propose a structure.melting119e up) be-ts.12. You have two samples: one is known to be acetophenone, while the other oneis 1-phenylethanol. How would you know which one is which using infraredspectroscopy?HO,13. Luis A. reacted cyclohexene with H, in the presence of a Pd catalyst. Howcould Luis follow the reaction using IR?Boilingpoint14. Esterification of acetic acid with isopentanol in acidic conditions led to aliquid. Two carbonyl peaks are observed in IR: a large peak at 1730 cm-1, witha smaller peak at 1715 cm-1. Explain.15. How would you decide which compound is which using only IR spectroscopy?Benzoic acid and acetophenoneb. Ethyl methyl ether and propanol. Acetophenone and benzaldehyded. 2-Cyanobutane and 2-methylbutanoic acidPhenol and cyclohexanola.e.elemental analysis. The IR spectrum of her sample shows peaks at 3028, 1710(strong), 1600 (sharp), and 1377 cm-1.16. Z. a with as shown by

11. Given : Percent composition of C = 72.4 % Percent composition of H = 13.8 % Percent…

11. An unknown sample is being submitted for elemental analysis. The follow- ing results are obtained: 72.4 % C, 13.8 % H and 0 % N. Knowing that the sample's molecular weight is 116, what is the molecular formula of this com- pound? Propose a structure.

11. An unknown sample is being submitted for elemental analysis. The follow- ing results are obtained: 72.4 % C, 13.8 % H and 0 % N. Knowing that the sample's molecular weight is 116, what is the molecular formula of this com- pound? Propose a structure.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

11,12,13

poihts.
Calculate the standard refractive index.
11. An unknown sample is being submitted for elemental analysis. The follow-
ing results are obtained: 72.4 % C, 13.8 % H and 0 % N. Knowing that the
sample's molecular weight is 116, what is the molecular formula of this com-
pound? Propose a structure.
melting
119
e up) be-
ts.
12. You have two samples: one is known to be acetophenone, while the other one
is 1-phenylethanol. How would you know which one is which using infrared
spectroscopy?
HO,
13. Luis A. reacted cyclohexene with H, in the presence of a Pd catalyst. How
could Luis follow the reaction using IR?
Boiling
point
14. Esterification of acetic acid with isopentanol in acidic conditions led to a
liquid. Two carbonyl peaks are observed in IR: a large peak at 1730 cm-1, with
a smaller peak at 1715 cm-1. Explain.
15. How would you decide which compound is which using only IR spectroscopy?
Benzoic acid and acetophenone
b. Ethyl methyl ether and propanol
. Acetophenone and benzaldehyde
d. 2-Cyanobutane and 2-methylbutanoic acid
Phenol and cyclohexanol
a.
e.
elemental analysis. The IR spectrum of her sample shows peaks at 3028, 1710
(strong), 1600 (sharp), and 1377 cm-1.
16. Z. a with as shown by

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4 1. 4Be + 2He → 6C+, le 1H 1. On 2 1H
2 pt Please provide an explanation for the relatively high boiling points of H20, HF, and NH3 in comparison to the hydrogen compounds of other elements in the respective groups. 100 H2O Group 16 (6A) HF Group 17 (7A) H,Te SbH3 H,Se HI NH3 Group 15 (5A) H.S ASH5 SnH4 HCI HBr PH, GeH, -100 SiH CH Group 14 (4A) -200 1 3. 4 Period HTML Editor B IUA 工E三州星xx 三= A 12pt Paragraph Boiling point ('C)
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CONCLUSIONS: In general, the boiling points of compounds increase down a group in the periodic table. The melting points and boiling points for the hydrogen compounds of group 6A elements are in the table below. Melting Point (°C) Boiling Point (°C) H₂O 0.0 100.0 H₂S -82.0 -60.0 H₂Se -65.7 -41.2 H₂Te -49.0 -2.2 Use your understanding of chemistry to propose an explanation for the anomaly in the trend for the hydrogen compounds of group 6A elements shown in the table.
X H3O+