HEAT OF FORMATION
��Aromatic Substances
��^T
� �Heat of Formation
�Heat
�Name
�Formula
� � � � �of Com-
� � �Gas
�Liquid
�Solid
�Dis- solved
�bustion
� � � � � � �Cal.
�Benzene .
�C 6 H 6 j
i
�-11-3*
�- 4-1*
�Naphthalene .
�-22-8*
�Phenol
�36-8*
�Resorcin .
�CeHgOg
� � �89-4*
�Hydroquinone .
�id.
� � �87-3*
�Pyrocatechin .
�id.
� � �87-6*
�Gresol, ortho- .
� � �56-3*
�„ para- .
�id. ,
� � �55-1*
�„ meta- .
�id. i
�55-7*
�Benzoic acid .
�C r H 6 2 !
�94-2*
�Benzaldehyde .
�C 7 H 6 ;
� �25-4*
�•
�Benzyl alcohol .
� �40-8*
�Methyl benzoate
� �86-8*
�Salicylic acid .
�C 7 H 6 s
� � �1321*
�Paraoxybenzoic
�i
� � � � �i
�acid
�id.
� � �141-2*
�Metaoxybenzoic
� � � � � � �acid
�id. !
� � �138-1*
�Aniline
�C 6 H 7 N
� �-11-2*
�Azobenzene
� �- 79-2*
�Nitrobenzene .
� �51*
�Meta-dinitroben-
� � � � � � �zene
� � �6-8*
�Phenylhydrazine
� �36 *
�Terebenthene .
�4-2*
�Camphor .
�C 10 H 18 O
� � �80-3*
��The asterisk (*) denotes the heat of formation directly calculated from the heat of combustion.
��For the higher homologues of the aromatic substances the heats of combustion can be obtained sufficiently closely by adding 155 Cal. for each additional CH 2 group. As for the fatty compounds, so in general with the aromatic sub- stances, the heat of combustion is only strongly influenced by isomerism in so far as it affects the linkages which exist between the carbon atoms (single, double, or triple bonds).
�� �
