Title: Application of Brönsted’s principle of congruence toVEandCEpof (cyclohexane or chlorobenzene or 1-chloronaphthalene + ann-alkane + anothern-alkane)
Abstract: Excess molar volumesVEmand excess molar heat capacitiesCEp,mhave been measured through the composition range for quasi-binaries: [x{A =c-C6H12or C6H5Cl or 1-C10H7Cl (1-chloronaphthalene)} + (1 -x) {XCH3(CH2)ν2- 2CH3+ (1 -X)CH3(CH2)ν3-2CH3}] for ν2= 16 or 10 and ν3= 7.VEm(x) andCEp,m(x) values for the quasi-binaries were fitted by means of empirical equations for eachXand also to a ternary correlation equation covering the wholexandXranges. Two similar tests of Brönsted’s Principle of Congruence have been applied: (1), atx= 0.5,VEmandCEp,mwere plotted against the average alkane carbon number 〈ν〉 =Xν2+ (1 -x)ν3; these values were consistent, as required by the Principle with those obtained from a mixture of A with a pure alkane of carbon number ν = 〈ν〉; (2),VEmandCEp,mfor (A +n-alkane mixtures of mole fractionX) were successfully compared, through thexrange, with theVEmandCEp,mfor (A + pure alkane) interpolated from literature values to the 〈ν〉 corresponding to the presentX. The success of the Principle in the case ofVEmandCEp,mis surprising since these quantities depend, respectively, on liquid “free volume” and alkane “orientational order” which are not obviously the same for a pure alkane and its congruent alkane mixture.
Publication Year: 1995
Publication Date: 1995-01-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 2
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