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The existing thermochemical data on the normal olefin (al kene-I) hydrocarbons are reviewed and conelated. These data are used in conjunction with the value previously proposea for the increase in the heat content per added CH2 group to obtain values for those members of this series of hydrocarbons for which no calorimetric data exist. For all these hydrocarbons in the gaseous state, selected "best" values are given for the heats of combustion at 25°C and for the heats of formation, from solid carbon and gaseous hydrogen , at 25°C and OOK. As in the case of the previously reported values for the normal paraffin hydrocarbons and primary normal alkyl alcohols, the heats of formation of the gaseous normal olefin (alkene-I ) hydrocarbons can he r epresented by means of an expression of the form t::.H = A+ Bn+t::., where t::.1-1 is the heat of formation, A and B are constant for a given temperature, n is the number of carbon atoms in the molecule Cn H2n , and t::. is the t erm giving the deviation from linearity, which is zero for n> 5. Values of the constants A and B and of t::. are given both for 25° C and 0° K. CONTENTS Page

Heats of combustion and of formation of the normal olefin (alkene-1) hydrocarbons in the gaseous state