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Thi invcs tigfttio n is a co nlinuat ion of Lh e program [1 , 2, ;~, 4] 2 o n the determination of some of Lhe thermod~~ llfimic p roperties of compound s of importance ill Lhc Iial ional synLhet ic rubbcr program . In the s tud.\~ of the processes of polymerization and depol~~mNi zaL i o ll , it is impor tanL lo have thermod~~ ­ Jlamic dala for the compound s in tile li q uid as well as in tlie gaseous s tate, and daLa on the variatio n of these properties wiLh carbon cha in length. Previous studies [5, 6] h ave show n thaL for several homologous cr ies of gaseou s hydrocarbons the heat of comb usLion increases b~a constant amounL upon Lhe add ition of eac h CH2 group in t he n-alk:r1 side chai n ; the first few m embers of each series arc anomalous. In an earl ier paper [5J the variation , with chain length, in the heat of comb ustion was stutlied for the liqu id normal paraffins. The i ncrement 156.26 kcal pel' CH2 gro up was calculated , b~' the method of least squares, from these experimelltal data. This in crement, together with previously reported values for th e heats of combusLion of the I-alkenes [2, 22 , 23 , 24J alkylbenze ll es [19 , 20J n-alkyl c~Telopentanes [21], and n-alkylc~Tcloh('xa n es [2 1J was used to calculate values for tIle heats of combusLion of higher members of these series. Up Lo t he presen t time there has been no experimental chec k on the validity of this extrapolation . Therefore, it seemed desirable to m easure the heat of combustion of a higher member of eac h cries. In t hi s investigation the heats of combustion of 1-hexadecene, n -c! ecylbenzene , n-d ecylc)Telopenlane, n-clec~-lc~~cloh exan e , and n-hexad ecane were

journal of research of the national bureau of standards

Heats of combustion of liquid n-hexadecane, 1-hexadecene, n-decylbenzene, n-decylcyclohexane, n-decylcyclopentane, and the variation of heat of combustion with chain length