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Chemistry LibreTexts

Solutions

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

1. Using the alphabet, answer the following:
a) how many letters have a mirror plane?  26
b) how many letters have more than one mirror plane? 15
c) how many letters have a rotational axis?  17
d) which letter has the highest ordered rotational axis?  I (assuming cylinder) or (O assuming circle)
e) which letters have an inversion center?  H, I, N, O, S, X, Z

2.  Determine all of the symmetry elements in each of the following:
 

your left shoe  E eclipsed ethane  E, C3, 3C2,sh, 3sv, S3
Fe(CO) E, C3, 3C2, sh, 3sv, S3 CHF3  E, C3, 3sv
CF2H2  E, C2, 2sv CFH3  E, C3, 3sv
IBr4 E, C2, 2sv COS  E, Cinf, inf sv
IBr4 E, C4, 4C2, sh, 4sv, i, S4 SO E, C2, 2sv
HF  E, Cinf, inf sv F E, Cinf, inf C2, sh, inf sv, i, Sinf
BFCl E, C2, 2sv BFClBr  E, sh
CoCl3(OH2)- E, C3, 3sv Cu(CN)3 E, C3, 3C2, sh, 3sv, S3

inf = infinity

 

3. Determine the point group for each of the following:(point group flow chart)
 

SFOh eclipsed ethane  D3h
CHTd CHFC3v
CF2HC2v CFHC3v
IBr4C2v COS  Cinfv
IBr4D4h SOC2v
HF  Cinfv FDinfh
BFClC2v BFClBr  Cs
CoCl3(OH2)-   C3v Cu(CN)3       (planar) D3h
Ni(CO)4     Td Fe(CO)D3h
your left shoe  C1 a round doorknob  Cinfv

inf = infinity