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7.128 SECTION 7<br />

TABLE 7.76<br />

Condensed Table of Mass Spectra<br />

Mass numbers (and intensities) of:<br />

Molecular<br />

formula<br />

Name<br />

Parent<br />

peak<br />

Base<br />

peak<br />

Three next most intense peaks<br />

B 2 H 6 Diborane 28(0.13) 26(54) 27(52) 24(48) 25(30)<br />

B 3 H 6 N 3 Triborine triamine 81(21) 80(58) 79(37) 53(29) 52(22)<br />

B 5 H 9 Pentaborane 64(15) 59(30) 60(30) 62(24) 61(21)<br />

CBrClF 2 Difluorochlorobromomethane 164(0.23) 85(86) 87(27) 129(17) 131(16)<br />

CBr 2 F 2 Difluorodibromomethane 208(1.7) 129(70) 131(68) 79(18) 31(18)<br />

CCl 2 F 2 Difluorodichloromethane 120(0.07) 85(33) 87(11) 50(3.9) 101(2.8)<br />

CCl 3 F Fluorotrichloromethane 136(0.04) 101(54) 103(35) 66(7.0) 35(5.8)<br />

CCl 4 Tetrachloromethane 152(0.0) 117(39) 119(37) 35(16) 47(16)<br />

CF 3 I Trifluoroiodomethane 196(51) 196(51) 127(49) 69(40) 177(16)<br />

CF 4 Tetrafluoromethane 88(0.0) 69(57) 50(6.8) 19(3.9) 31(2.8)<br />

CHBrClF Fluorochlorobromomethane 148(5.5) 67(120) 69(38) 31(13) 111(11)<br />

CHBrF 2 Difluorobromomethane 130(13) 51(83) 31(18) 132(13) 79(13)<br />

CHCl 3 Trichloromethane 118(1.3) 83(69) 85(44) 47(24) 35(13)<br />

CHF 3 Trifluoromethane 70(0.25) 69(20) 51(18) 31(9.9) 50(2.9)<br />

CHN Hydrogen cyanide 27(92) 27(92) 26(15) 12(3.8) 28(1.6)<br />

CH 2 ClF Fluorochloromethane 68(48) 68(48) 33(25) 70(15) 49(11)<br />

CH 2 Cl 2 Dichloromethane 84(41) 49(71) 86(26) 51(21) 47(13)<br />

CH 2 F 2 Difluoromethane 52(2.7) 33(26) 51(25) 31(7.3) 32(2.9)<br />

CH 2 O Methanal (formaldehyde) 30(19) 29(21) 28(6.6) 14(0.94) 13(0.92)<br />

CH 2 O 2 Methanoic acid (formic) 46(72) 29(118) 45(56) 28(20) 17(20)<br />

CH 3 Cl Chloromethane 50(66) 50(66) 15(54) 52(21) 49(6.6)<br />

CH 3 F Monofluoromethane 34(29) 15(31) 33(28) 14(5.3) 31(3.2)<br />

CH 3 I Indomethane 142(78) 142(78) 127(29) 141(11) 15(10)<br />

CH 3 NO 2 Nitromethane 61(35) 30(65) 15(34) 46(23) 29(5.3)<br />

CH 4 Methane 16(67) 16(67) 15(58) 14(11) 13(5.5)<br />

CH 4 O Methanol 32(26) 31(38) 29(25) 28(2.4) 18(0.7)<br />

CH 4 S Methanethiol 48(49) 47(65) 45(40) 46(9.5) 15(8.9)<br />

CH 5 N Aminomethane (methylamine) 31(30) 30(53) 28(47) 29(8.7) 27(8.6)<br />

CO Carbon monoxide 28(78) 28(78) 12(3.7) 16(1.3) 29(0.9)<br />

COS Carbonyl sulfide 60(83) 60(83) 32(48) 28(6.9) 12(5.0)<br />

CO 2 Carbon dioxide 44(76) 44(76) 28(5.0) 16(4.7) 12(1.9)<br />

CS 2 Carbon disulfide 76(184) 76(184) 32(40) 44(33) 78(16)<br />

C 2 F 4 Tetrafluoroethene 100(20) 31(47) 81(34) 50(14) 12(3.6)<br />

C 2 F 6 Hexafluoroethane 138(0.14) 69(95) 119(39) 31(17) 50(9.6)<br />

C 2 F 6 Hg Hexafluorodimethylmercury 340(0.83) 69(111) 202(26) 271(22) 200(21)<br />

C 2 H 2 Ethyne 26(102) 26(102) 25(20) 24(5.7) 13(5.7)<br />

C 2 H 2 ClN Chloroethanenitrile 75(51) 75(51) 48(46) 40(23) 77(16)<br />

C 2 H 2 Cl 2 cis-1,2-Dichloroethene 96(53) 61(72) 98(34) 63(23) 26(22)<br />

C 2 H 2 Cl 2 trans-1,2,-Dichloroethene 96(49) 61(73) 98(32) 26(25) 63(23)<br />

C 2 H 2 Cl 4 1,1,2,2-Tetrachloroethane 166(5.9) 83(95) 85(60) 95(11) 87(9.7)<br />

C 2 H 2 F 2 1,1-Difluoroethene 64(32) 64(32) 45(21) 31(16) 33(13)<br />

C 2 H 3 Cl 3 1,1,1-Trichloroethane 132(0.0) 97(37) 99(24) 61(19) 117(7.1)<br />

C 2 H 3 Cl 3 1,1,2-Trichloroethane 132(3.9) 97(43) 83(41) 99(27) 85(26)<br />

C 2 H 3 F 3 1,1,1-Trifluoroethane 84(0.94) 69(81) 65(31) 15(13) 45(10)<br />

C 2 H 3 N Ethanenitrile 41(89) 41(89) 40(46) 39(17) 38(10)<br />

C 2 H 4 Ethene (ethylene) 28(66) 28(66) 27(43) 26(41) 25(7.8)<br />

C 2 H 4 BrCl 1-Chloro-2-bromoethane 142(7.9) 63(93) 27(82) 65(30) 26(24)<br />

C 2 H 4 Br 2 1,2-Dibromoethane 186(1.6) 27(93) 107(72) 109(67) 26(23)<br />

C 2 H 4 Cl 2 1,1-Dichloroethane 98(5.7) 63(89) 27(64) 65(28) 26(21)

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