The heats of combustion of benzene, toluene, ethylbenzene, o-xylene, m-xylene, p-xylene, n -propylbenzene, and styrene were measured with a bomb calorimeter.The following values were obtained for the heat of combustion, at 25° C and constant pressure, of the liq uid hydrocarbon in gaseous oxygen to form gaseous carbon dioxide and liquid water, with all the r eactants and products in their thermodynamic standard reference states, in international kilojoules per mole: Benzene,3267.09 ±0043; tolU ene, 3909.31 ± 0 049; ethylbenzene, 4564.09 ± 0.72 ; o-xylene, 4552.10 ± 1.02 ; m-xylene, 4551.10 ± 0.62; p-xylene'w4552.09 ± 0.91 ; n-propylbenzene, 5217.37 ± 0.68 ; styrene 4394.14 ± 0.82.ith the factor 1/4.1833, the corresponding values in kilocalories per mole are b enzene, 780.98
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